Threads about the USA conquering or buying the whole of Canada always seem to infuriate Canadians and delight Americans... so, let's consider a lesser scenario. When you look at a map of N. America, chunks of Canada sit rather weirdly south of the St. Lawrence River, which seems to be a much more likely natural border. So... how do we get the US to control this chunk of Canada (everything south of the St. Lawrence, Brunswick, and Nova Scotia), with the St. Lawrence being the boundary between the US and Canada? My best guess is having the US do much better in the ARW and War of 1812, but maybe someone else has a better idea...