I'm not sure who "us" is here, but I would suspect that the US could occupy Canada, Greenland, or Mexico with only small regional skirmishes. No nukes (detonate

I'm not sure who "us" is here, but I would suspect that the US could occupy Canada, Greenland, or Mexico with only small regional skirmishes. No nukes (detonated) at all. I hope I'm very wrong -- or that if I'm right, the US public too polite to tolerate it.