@evan@cosocial.ca
Another option would be seizing unoccupied territory along the border between the lower 48 and Canada. There's a lot of sparsely-populated land up there, and it'd be possible to get a big, scary chunk of the map coloured maple-leaf red on the nightly news. The parts of Maine north of the 45th parallel are very empty and would actually be quite nice to have on our side, anyway. It's a pain to have to drive around them to get to New Brunswick!
@evan@cosocial.ca
Most US overseas territories aren't great candidates. The US has a lot of territories spread across the Pacific, which are hard for European powers to take and hold.