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Post by american2006 on Feb 2, 2021 16:15:35 GMT
Well, that’s surely grim. What would happen to Canada, they lose there number 1 trade partner, defender, and there only neighbor. Do they ally with another country, would they relocate further North as to avoid flooding?
What flooding? With the US gone sea levels are likely to drop depending on how deep the gap is below sea level where the US used to be. Damn we could end up not being an island again if it drops low enough!  Unless you mean that the sea rushing in will cause a lot of flooding in border areas, which is a possibility but that could be across a good bit of the world. [Given that its believed that landslides from a volcano in the Canaries can cause devastating floods across N America, as well as elsewhere, what happens when half a continent disappears?] Much of the Canadian border with the US is quite high so their biggest problem might be getting ports on their new southern border as a lot of it will be quite a way above even the old sea level, let alone the new one.
One other bad effect for Canada is that the Great Lakes and most/all of the St Lawrence has gone as the waters of the former, which is the vast majority of supply for the latter, will be flowing into the new ocean south of Canada.
As american2006, says there are going to be huge climatic impacts, including probably a severe chilling of western Europe. It's not certain because the entire world climatic system is going to be thrown into disorder and it could take quite a while before things settle down to a new 'stability'. For one thing the Bering Straits are now much wider - unless possibly affected by the drop in sea level. IIRC the arctic is icebound because its largely enclosed which restricts water waters from lower latitudes so this could have an impact in making it melt even more rapidly with considerable impact on local lands and again the world climate will be affected. Ditto with the impact of the Atlantic and Pacific having a fairly broad common border where the US used to be.
Politically and economically, as well as the panic the sudden unexplained disappearance will cause that James G, mentioned the world economic system and balance of power will be thrown into chaos. Russia and China are the two biggest gainers, at least in the short term and you might well see a Chinese move to 'liberate' Taiwan and probably tighten their grip in the S China Sea as well as possible clashes elsewhere. The big issue is possibly what does Putin do? Does he think that opens the door to conquests in the west or does he realise that the dragon to the east is no longer checked by the US? Economically China is even more powerful but it will have lost a lot of assets in the former US and the disruption of world trade will cause problems for everybody.
The Europeans will have to make some decisions quickly but the big problem here will probably be the EU. Its already got used to considering itself as 'all' of Europe so will it accept there are other powers, not just Britain, involved on the continent. If we can get an intelligent agreement to reogranise NATO in response to what's happened and possibly link up with other regional defence groupings then it might stablish things somewhat but I fear that Taiwan and quite possibly S Korea will be lost to dictatorships. Japan will have to re-militarise a lot more and probably go nuclear, which with its technology level it can probably do pretty quickly. Although it might face threats of 'preventive' attacks from either China or N Korea in such a circumstance. I can see it seeking to link up with other powers, most noticeably India and possibly a good amount of ASEAN for common defence.
The ME is going to be a mess, even more than now. With the US gone and the European powers almost certainly removing any military presence to secure their homelands the potential for more conflict is very likely to explode. Israel has lost its primary ally/defender, Iran its biggest check and what does Turkey do? You could see attacks on Israel, Iran making a bit for the oil of the Gulf - especially since there's a lot of Shias there who might welcome them, at least at 1st, Turkey getting adventurous or any combination of those. Ditto further east with Afghanistan and C Asia. I fear that with Pakistan's support, which is likely to be more open now, that Taliban will escalate its murder campaign and probably conquer Afghanistan again.
I should clarify, the US’s land is replaced with water, just at sea level. I say flooding as the changes in climate would stop water flows to Western Europe (UK would have to hammer out a border with France, other nations too, as the Mid-Atlantic Current would now not go to Europe it would go towards the neck of Canada, likely wiping out that portion. As to changes in the global climate yes, the Atlantic and Pacific Oceans especially would have major changes. Baja California and New Brunswick might end up islands. |
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stevep
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Post by stevep on Feb 2, 2021 18:45:22 GMT
What flooding? With the US gone sea levels are likely to drop depending on how deep the gap is below sea level where the US used to be. Damn we could end up not being an island again if it drops low enough! Unless you mean that the sea rushing in will cause a lot of flooding in border areas, which is a possibility but that could be across a good bit of the world. [Given that its believed that landslides from a volcano in the Canaries can cause devastating floods across N America, as well as elsewhere, what happens when half a continent disappears?] Much of the Canadian border with the US is quite high so their biggest problem might be getting ports on their new southern border as a lot of it will be quite a way above even the old sea level, let alone the new one.
One other bad effect for Canada is that the Great Lakes and most/all of the St Lawrence has gone as the waters of the former, which is the vast majority of supply for the latter, will be flowing into the new ocean south of Canada.
As american2006 , says there are going to be huge climatic impacts, including probably a severe chilling of western Europe. It's not certain because the entire world climatic system is going to be thrown into disorder and it could take quite a while before things settle down to a new 'stability'. For one thing the Bering Straits are now much wider - unless possibly affected by the drop in sea level. IIRC the arctic is icebound because its largely enclosed which restricts water waters from lower latitudes so this could have an impact in making it melt even more rapidly with considerable impact on local lands and again the world climate will be affected. Ditto with the impact of the Atlantic and Pacific having a fairly broad common border where the US used to be.
Politically and economically, as well as the panic the sudden unexplained disappearance will cause that James G , mentioned the world economic system and balance of power will be thrown into chaos. Russia and China are the two biggest gainers, at least in the short term and you might well see a Chinese move to 'liberate' Taiwan and probably tighten their grip in the S China Sea as well as possible clashes elsewhere. The big issue is possibly what does Putin do? Does he think that opens the door to conquests in the west or does he realise that the dragon to the east is no longer checked by the US? Economically China is even more powerful but it will have lost a lot of assets in the former US and the disruption of world trade will cause problems for everybody.
The Europeans will have to make some decisions quickly but the big problem here will probably be the EU. Its already got used to considering itself as 'all' of Europe so will it accept there are other powers, not just Britain, involved on the continent. If we can get an intelligent agreement to reogranise NATO in response to what's happened and possibly link up with other regional defence groupings then it might stablish things somewhat but I fear that Taiwan and quite possibly S Korea will be lost to dictatorships. Japan will have to re-militarise a lot more and probably go nuclear, which with its technology level it can probably do pretty quickly. Although it might face threats of 'preventive' attacks from either China or N Korea in such a circumstance. I can see it seeking to link up with other powers, most noticeably India and possibly a good amount of ASEAN for common defence.
The ME is going to be a mess, even more than now. With the US gone and the European powers almost certainly removing any military presence to secure their homelands the potential for more conflict is very likely to explode. Israel has lost its primary ally/defender, Iran its biggest check and what does Turkey do? You could see attacks on Israel, Iran making a bit for the oil of the Gulf - especially since there's a lot of Shias there who might welcome them, at least at 1st, Turkey getting adventurous or any combination of those. Ditto further east with Afghanistan and C Asia. I fear that with Pakistan's support, which is likely to be more open now, that Taliban will escalate its murder campaign and probably conquer Afghanistan again.
I should clarify, the US’s land is replaced with water, just at sea level. I say flooding as the changes in climate would stop water flows to Western Europe (UK would have to hammer out a border with France, other nations too, as the Mid-Atlantic Current would now not go to Europe it would go towards the neck of Canada, likely wiping out that portion. As to changes in the global climate yes, the Atlantic and Pacific Oceans especially would have major changes. Baja California and New Brunswick might end up islands.
OK thanks for clarifying. I don't see what you mean by hammering out a border with France as water levels won't change, although as you say its likely to get a lot colder in western Europe, unless some other change balances that. Which might cause some lowering of sea level if there was more permanent snow but not likely to be significant enough to lower sea levels I would have suspected. Similarly while a different flow of currents might warm eastern Canada I can't really see it causing flooding? Good point about Baja.
Steve
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Post by american2006 on Feb 2, 2021 18:51:40 GMT
I should clarify, the US’s land is replaced with water, just at sea level. I say flooding as the changes in climate would stop water flows to Western Europe (UK would have to hammer out a border with France, other nations too, as the Mid-Atlantic Current would now not go to Europe it would go towards the neck of Canada, likely wiping out that portion. As to changes in the global climate yes, the Atlantic and Pacific Oceans especially would have major changes. Baja California and New Brunswick might end up islands.
OK thanks for clarifying. I don't see what you mean by hammering out a border with France as water levels won't change, although as you say its likely to get a lot colder in western Europe, unless some other change balances that. Which might cause some lowering of sea level if there was more permanent snow but not likely to be significant enough to lower sea levels I would have suspected. Similarly while a different flow of currents might warm eastern Canada I can't really see it causing flooding? Good point about Baja.
Steve
So, to explain the changes in water levels, parts of the interior United States are barely above sea level and if just flat replaced with water, new current would move water into Canada and diverting us away from Europe. So sea levels around the world would lower, causing islands to no longer be islands. Basically, the changes in sea patterns would change global coastlines, hitting Canada especially hard and drying up the North Sea (as well as the English Channel) and additionally, although I didn’t think of this before, the currents that traditionally go along the coast of California no longer would. The mid Atlantic current would actually probably start flowing in the Pacific Ocean, moving warm water up through Canada and going accross the Pacific to various places. |
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lordroel
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Post by lordroel on Feb 2, 2021 18:55:25 GMT
OK thanks for clarifying. I don't see what you mean by hammering out a border with France as water levels won't change, although as you say its likely to get a lot colder in western Europe, unless some other change balances that. Which might cause some lowering of sea level if there was more permanent snow but not likely to be significant enough to lower sea levels I would have suspected. Similarly while a different flow of currents might warm eastern Canada I can't really see it causing flooding? Good point about Baja. Steve
So, to explain the changes in water levels, parts of the interior United States are barely above sea level and if just flat replaced with water, new current would move water into Canada and diverting us away from Europe. So sea levels around the world would lower, causing islands to no longer be islands. Basically, the changes in sea patterns would change global coastlines, hitting Canada especially hard and drying up the North Sea (as well as the English Channel) and additionally, although I didn’t think of this before, the currents that traditionally go along the coast of California no longer would. The mid Atlantic current would actually probably start flowing in the Pacific Ocean, moving warm water up through Canada and going accross the Pacific to various places. Would this not be a mass death scenario as a lot of people across the world will die. |
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Post by american2006 on Feb 2, 2021 18:57:11 GMT
So, to explain the changes in water levels, parts of the interior United States are barely above sea level and if just flat replaced with water, new current would move water into Canada and diverting us away from Europe. So sea levels around the world would lower, causing islands to no longer be islands. Basically, the changes in sea patterns would change global coastlines, hitting Canada especially hard and drying up the North Sea (as well as the English Channel) and additionally, although I didn’t think of this before, the currents that traditionally go along the coast of California no longer would. The mid Atlantic current would actually probably start flowing in the Pacific Ocean, moving warm water up through Canada and going accross the Pacific to various places. Would this not be a mass death scenario as a lot of people across the world will die. I mean technically yes but it isn’t centered around massive numbers of people dieing Morley about how the world reacts to suddenly having the US disappear. |
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stevep
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Post by stevep on Feb 2, 2021 19:10:52 GMT
OK thanks for clarifying. I don't see what you mean by hammering out a border with France as water levels won't change, although as you say its likely to get a lot colder in western Europe, unless some other change balances that. Which might cause some lowering of sea level if there was more permanent snow but not likely to be significant enough to lower sea levels I would have suspected. Similarly while a different flow of currents might warm eastern Canada I can't really see it causing flooding? Good point about Baja.
Steve
So, to explain the changes in water levels, parts of the interior United States are barely above sea level and if just flat replaced with water, new current would move water into Canada and diverting us away from Europe. So sea levels around the world would lower, causing islands to no longer be islands. Basically, the changes in sea patterns would change global coastlines, hitting Canada especially hard and drying up the North Sea (as well as the English Channel) and additionally, although I didn’t think of this before, the currents that traditionally go along the coast of California no longer would. The mid Atlantic current would actually probably start flowing in the Pacific Ocean, moving warm water up through Canada and going accross the Pacific to various places.
Sorry I possibly getting confused? I thought when you said earlier "I should clarify, the US’s land is replaced with water, just at sea level." that new water is automatically generated to replace the lost lands, but only up to current sea level. As such while ocean currents and other related patters would change I though have thought there's neither space for water to flow into - lowering sea levels - or additional water appearing to raise them. If you mean that the land disappear, down to some level below sea level then water will flow in to fill it up, which will lower sea levels. How far that would depend on how low the ground is removed to.
I will be on other sites from now on but will try and catch up tomorrow.
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Post by american2006 on Feb 5, 2021 17:46:19 GMT
So, to explain the changes in water levels, parts of the interior United States are barely above sea level and if just flat replaced with water, new current would move water into Canada and diverting us away from Europe. So sea levels around the world would lower, causing islands to no longer be islands. Basically, the changes in sea patterns would change global coastlines, hitting Canada especially hard and drying up the North Sea (as well as the English Channel) and additionally, although I didn’t think of this before, the currents that traditionally go along the coast of California no longer would. The mid Atlantic current would actually probably start flowing in the Pacific Ocean, moving warm water up through Canada and going accross the Pacific to various places.
Sorry I possibly getting confused? I thought when you said earlier "I should clarify, the US’s land is replaced with water, just at sea level." that new water is automatically generated to replace the lost lands, but only up to current sea level. As such while ocean currents and other related patters would change I though have thought there's neither space for water to flow into - lowering sea levels - or additional water appearing to raise them. If you mean that the land disappear, down to some level below sea level then water will flow in to fill it up, which will lower sea levels. How far that would depend on how low the ground is removed to.
I will be on other sites from now on but will try and catch up tomorrow.
Yes it is generated to be at sea level as it is now, and no one. However, parts of Canada are close to sea level which would cause this new water to move in there. |
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575
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Post by 575 on Feb 28, 2021 11:42:21 GMT
OK thanks for clarifying. I don't see what you mean by hammering out a border with France as water levels won't change, although as you say its likely to get a lot colder in western Europe, unless some other change balances that. Which might cause some lowering of sea level if there was more permanent snow but not likely to be significant enough to lower sea levels I would have suspected. Similarly while a different flow of currents might warm eastern Canada I can't really see it causing flooding? Good point about Baja.
Steve
So, to explain the changes in water levels, parts of the interior United States are barely above sea level and if just flat replaced with water, new current would move water into Canada and diverting us away from Europe. So sea levels around the world would lower, causing islands to no longer be islands. Basically, the changes in sea patterns would change global coastlines, hitting Canada especially hard and drying up the North Sea (as well as the English Channel) and additionally, although I didn’t think of this before, the currents that traditionally go along the coast of California no longer would. The mid Atlantic current would actually probably start flowing in the Pacific Ocean, moving warm water up through Canada and going accross the Pacific to various places. How deep is the United States Sea going to reach? Is water created to replace land or flow in from existing oceans. Sorry have difficulty in percieving this! If low dept there may not be that much of a displacement in ocean current across the former US - if deep of course yes. If as you say waters are receding from islands draining areas like the North Sea a lot is going to happen. The Baltic will become a lake and the Russkies will have to dig a channel to get their Baltic Navy into the Oceans. Britain have the Chunnel to link to Europe but the ferries across the North Sea is gone. It will take some time to build a few highways and railroads across Dogger/North Sea Land. Hamburg and Rotterdam and possibly Antwerp ports may be gone. Finland will have no ocean outlet to the world anymore as won't Denmark, Sweden, Poland and the Baltic Nations. At least we have the Oeresund Bridge to Sweden making for still road/rail transport around the Baltic Lake. Quite a lot of ports will have to relocate towards the new shore lines. The EU will be forced to adopt NATO as its REAL defensive pact to deter the Russians. No more squabbling around. May make for some headaches regarding Britain and Ireland.
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gillan1220
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Post by gillan1220 on Feb 28, 2021 14:09:10 GMT
Global economic collapse. China would be happy as it would become the next superpower without lifting a finger.
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Post by american2006 on Feb 28, 2021 15:53:25 GMT
So, to explain the changes in water levels, parts of the interior United States are barely above sea level and if just flat replaced with water, new current would move water into Canada and diverting us away from Europe. So sea levels around the world would lower, causing islands to no longer be islands. Basically, the changes in sea patterns would change global coastlines, hitting Canada especially hard and drying up the North Sea (as well as the English Channel) and additionally, although I didn’t think of this before, the currents that traditionally go along the coast of California no longer would. The mid Atlantic current would actually probably start flowing in the Pacific Ocean, moving warm water up through Canada and going accross the Pacific to various places. How deep is the United States Sea going to reach? Is water created to replace land or flow in from existing oceans. Sorry have difficulty in percieving this! If low dept there may not be that much of a displacement in ocean current across the former US - if deep of course yes. If as you say waters are receding from islands draining areas like the North Sea a lot is going to happen. The Baltic will become a lake and the Russkies will have to dig a channel to get their Baltic Navy into the Oceans. Britain have the Chunnel to link to Europe but the ferries across the North Sea is gone. It will take some time to build a few highways and railroads across Dogger/North Sea Land. Hamburg and Rotterdam and possibly Antwerp ports may be gone. Finland will have no ocean outlet to the world anymore as won't Denmark, Sweden, Poland and the Baltic Nations. At least we have the Oeresund Bridge to Sweden making for still road/rail transport around the Baltic Lake. Quite a lot of ports will have to relocate towards the new shore lines. The EU will be forced to adopt NATO as its REAL defensive pact to deter the Russians. No more squabbling around. May make for some headaches regarding Britain and Ireland.
It would be on the former east coast the same depth as 1,000 meters out and likewise on the Pacific and gradually meet in the middle, sorry for the confusion with this. And although the water for the US would be instantly generated I was thinking the new ocean currents would move water into Canada flooding somewhere around Ontario and Mantobia and bringing mild temperatures in the nearby non-flooded areas as the North Atlantic Current would now just go straight into Canada. This would cause less water to go into Europe drying up the channel and the Baltic region as well as colder weather in Europe (basically what today’s weather is along the same altitude in Russia). As to the geopolitical impacts yes China and her allies would be very happy while Europe faced serious issues. NATO may be forced to expand outside the North Atlantic to make up for the now absence of American military mussel |
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stevep
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Post by stevep on Feb 28, 2021 18:34:17 GMT
How deep is the United States Sea going to reach? Is water created to replace land or flow in from existing oceans. Sorry have difficulty in percieving this! If low dept there may not be that much of a displacement in ocean current across the former US - if deep of course yes. If as you say waters are receding from islands draining areas like the North Sea a lot is going to happen. The Baltic will become a lake and the Russkies will have to dig a channel to get their Baltic Navy into the Oceans. Britain have the Chunnel to link to Europe but the ferries across the North Sea is gone. It will take some time to build a few highways and railroads across Dogger/North Sea Land. Hamburg and Rotterdam and possibly Antwerp ports may be gone. Finland will have no ocean outlet to the world anymore as won't Denmark, Sweden, Poland and the Baltic Nations. At least we have the Oeresund Bridge to Sweden making for still road/rail transport around the Baltic Lake. Quite a lot of ports will have to relocate towards the new shore lines. The EU will be forced to adopt NATO as its REAL defensive pact to deter the Russians. No more squabbling around. May make for some headaches regarding Britain and Ireland.
It would be on the former east coast the same depth as 1,000 meters out and likewise on the Pacific and gradually meet in the middle, sorry for the confusion with this. And although the water for the US would be instantly generated I was thinking the new ocean currents would move water into Canada flooding somewhere around Ontario and Mantobia and bringing mild temperatures in the nearby non-flooded areas as the North Atlantic Current would now just go straight into Canada. This would cause less water to go into Europe drying up the channel and the Baltic region as well as colder weather in Europe (basically what today’s weather is along the same altitude in Russia). As to the geopolitical impacts yes China and her allies would be very happy while Europe faced serious issues. NATO may be forced to expand outside the North Atlantic to make up for the now absence of American military mussel
I can see ocean currents changing, with mixed impacts but probably very bad for Europe. However I can't see the adjustments to sea level changing. For one thing that would mean the sea leveling being higher in southern Canada and lower in NW Europe than elsewhere. Also don't forget that the southern border of Canada for most of its length is a good bit above sea level. For instance Ontario borders on four of the great lakes, with Lake Superior's surface being ~600' above sea level and even Lake Ontario, the lowest, is ~243' above sea level. As such to flood even the lowest parts of S Ontario would require waves that high. What would actually be the problem here is that since all the lakes now border the new Atlantic sea is they would all drain quickly into it. This would generate new land in their former basin but also mean the loss of fisheries, transport links and the like on the lakes themselves and also on the St Lawrence which would be pretty much dried up as other than tributaries from Canada east of the Lakes its lost all its inflow.
China would be happy in some ways but the ecological and economic impacts will hit everybody and the world has lost its greatest centre of agricultural surplus which is probably going to cause a serious crisis.
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575
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Post by 575 on Feb 28, 2021 20:59:58 GMT
How deep is the United States Sea going to reach? Is water created to replace land or flow in from existing oceans. Sorry have difficulty in percieving this! If low dept there may not be that much of a displacement in ocean current across the former US - if deep of course yes. If as you say waters are receding from islands draining areas like the North Sea a lot is going to happen. The Baltic will become a lake and the Russkies will have to dig a channel to get their Baltic Navy into the Oceans. Britain have the Chunnel to link to Europe but the ferries across the North Sea is gone. It will take some time to build a few highways and railroads across Dogger/North Sea Land. Hamburg and Rotterdam and possibly Antwerp ports may be gone. Finland will have no ocean outlet to the world anymore as won't Denmark, Sweden, Poland and the Baltic Nations. At least we have the Oeresund Bridge to Sweden making for still road/rail transport around the Baltic Lake. Quite a lot of ports will have to relocate towards the new shore lines. The EU will be forced to adopt NATO as its REAL defensive pact to deter the Russians. No more squabbling around. May make for some headaches regarding Britain and Ireland.
It would be on the former east coast the same depth as 1,000 meters out and likewise on the Pacific and gradually meet in the middle, sorry for the confusion with this. And although the water for the US would be instantly generated I was thinking the new ocean currents would move water into Canada flooding somewhere around Ontario and Mantobia and bringing mild temperatures in the nearby non-flooded areas as the North Atlantic Current would now just go straight into Canada. This would cause less water to go into Europe drying up the channel and the Baltic region as well as colder weather in Europe (basically what today’s weather is along the same altitude in Russia). As to the geopolitical impacts yes China and her allies would be very happy while Europe faced serious issues. NATO may be forced to expand outside the North Atlantic to make up for the now absence of American military mussel All-right! As I understand what you're saying is that the warm Gulfstream is mainly cut off from Europe and going into Canada instead. Ok - but I don't really see this as drying up the North Sea + Channel as it isn't just those areas but the entire global ocean level that needs lowering to do so. Anyway climate would change a lot with much colder winters on the Atlantic coast Spain, France, Ireland, Britain and in Scandinavia. Then the Arctic Ocean may get colder as the influx from the Gulfstream is cut off. |
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Post by american2006 on Feb 28, 2021 21:53:47 GMT
It would be on the former east coast the same depth as 1,000 meters out and likewise on the Pacific and gradually meet in the middle, sorry for the confusion with this. And although the water for the US would be instantly generated I was thinking the new ocean currents would move water into Canada flooding somewhere around Ontario and Mantobia and bringing mild temperatures in the nearby non-flooded areas as the North Atlantic Current would now just go straight into Canada. This would cause less water to go into Europe drying up the channel and the Baltic region as well as colder weather in Europe (basically what today’s weather is along the same altitude in Russia). As to the geopolitical impacts yes China and her allies would be very happy while Europe faced serious issues. NATO may be forced to expand outside the North Atlantic to make up for the now absence of American military mussel All-right! As I understand what you're saying is that the warm Gulfstream is mainly cut off from Europe and going into Canada instead. Ok - but I don't really see this as drying up the North Sea + Channel as it isn't just those areas but the entire global ocean level that needs lowering to do so. Anyway climate would change a lot with much colder winters on the Atlantic coast Spain, France, Ireland, Britain and in Scandinavia. Then the Arctic Ocean may get colder as the influx from the Gulfstream is cut off. So global warming would be averted as the earth (or the north at least) would face major cooling. My best guess is this results in a migration southward, with much of Europe moving to Italy, the Balkans, or North Africa. What would be the situation in northern Mexico as migrants have no where to go? |
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gillan1220
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Post by gillan1220 on Mar 1, 2021 10:11:00 GMT
My relatives in the U.S. are probably dead at this period.
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stevep
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Post by stevep on Mar 1, 2021 12:10:42 GMT
All-right! As I understand what you're saying is that the warm Gulfstream is mainly cut off from Europe and going into Canada instead. Ok - but I don't really see this as drying up the North Sea + Channel as it isn't just those areas but the entire global ocean level that needs lowering to do so. Anyway climate would change a lot with much colder winters on the Atlantic coast Spain, France, Ireland, Britain and in Scandinavia. Then the Arctic Ocean may get colder as the influx from the Gulfstream is cut off. So global warming would be averted as the earth (or the north at least) would face major cooling. My best guess is this results in a migration southward, with much of Europe moving to Italy, the Balkans, or North Africa. What would be the situation in northern Mexico as migrants have no where to go?
Well if the loss of the US affects ocean currents as expected then global warming would be drastically impacted in most of Europe and probably a mass death scenario there. How the rest of the world would be affected would be unclear. If the warm water is now staying around Canada it could heat that up faster and if the permafrost melts more rapidly and releases a lot more methane then in a few years that might mitigate what happens in Europe and would make the average world temperature rise even higher.
There's a possibility, in such an emergency situation you might even see a massive movement of Europeans to N Africa and the ME, if necessary by force, although that could be very bloody. What people will do when their desperate shouldn't be underestimated. Although since the latter are more heavily armed than much of Europe currently this could be more difficult than a lot of Europeans may initially think. Similarly depending on how badly Russia is hit you could well see a desire there for it to expand southwards into the former Soviet central Asia. Although again that would be bloody and put a lot of pressure on already strained ecologies.
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Unless you mean that the sea rushing in will cause a lot of flooding in border areas, which is a possibility but that could be across a good bit of the world. [Given that its believed that landslides from a volcano in the Canaries can cause devastating floods across N America, as well as elsewhere, what happens when half a continent disappears?] Much of the Canadian border with the US is quite high so their biggest problem might be getting ports on their new southern border as a lot of it will be quite a way above even the old sea level, let alone the new one.
