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@raharris1973 You are correct (I think), as to the ease of a canal along the old Colorado riverbed. Soft silt, c. 70-80km, maximum elevation 10 or 15m asl. Technically as easy as the Suez Canal. So, don't fill that gap between Mexico and Canada :) ADDED LATER: This canal is not a must have...

Even if there is melting in Greenland - which I doubt - the effects will be felt centuries if not millenia later. Nothing to worry about :)

Yes, that's the current (hehe, I so funny!) Science on the subject. Although I would not expect such a magnitude of changes, IMO you make a good point. The Arctic ACC (Antarctic Circumpolar Current) analog could dip southwards encircling Greenland, making it even colder. Maybe even Iceland is...

Nevertheless there could be some interesting changes to the USA's climate zones. Montana and the Dakotas should be wetter and less continental. Oregon gets colder? I wonder of the North Pacific Gyre could get split in two? It certainly will be messed up ...

I am half joking :) I many ISOT scenarios quite a few posters suggest (seriously) "USA takes Canada as it is there, next door, and the UK can't do anything about it". Here the USA is (much) less valuable to the UK and can't do anything about the UK taking Alaska if it wanted to. The USA not...

Now - with no USA on Canada's border - how long before the UK and Canada take Alaska? @stevep - good point about Montreal. With no Great Lakes AND the York Peninsula having sea access - it will stagnate into a sleepy derelict town of druggies and failed artists.

The Mexicans would still be fleeing poverty and strife. Also I was not fully serious in my post. By 1900 Canadian Authorities were allowing Catholics - Latin or Greek Rite both - into the country.

A problem I am worried about in respect to the tight, inviting Mexicanadian canal is providing it with adequate welcoming wetness. It could be dry, with not enough moisture for smooth operation of docks. But maybe the terrain is flat enough as to allow for a sea level canal, like the Suez...

The Panama Canal is indeed interesting. The USA does not need it for Navy, nor for commerce as the NW Passage is available, but there is the sunk cost fallacy. Would it sell to (quasi) private company? Would it sell to UK? The UK could be interested. But it was somewhat neglectful of Canada...

The taiga belt of Canada moves to the temperate zone, but the soils are bad. Will mass agri settlement be possible? The steppe zone should be wetter, at least parts of it, though ... Newfoundland would be interesting, seeing that it would move from central-north Finland to south New England...