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It looks to me - using the same sophisticated technical equipment you mentioned, i.e. the Mark 1 eyeball - that the northern region [now the southern] of the US would possibly be pretty much parallel with the cold current so that might get rather chilly although possibly push it a bit further...

Good points. That would save the two prime disaster's I was thinking of although what interactions of currents there would be with such a large path between the Atlantic and Pacific I wasn't sure. Ditto with Mexico as I should have thought of that. Could be a lot of water carrying clouds...

Well I'm only going to look at the 1866 scenario for simplicity but a hell of a lot of things to consider including four very important ones I don't think have been mentioned before. a) With the US gone what happens to the N Atlantic ocean currents, especially the Gulf Stream? Screw with that...