There are many worries about the States right now, mainly the inevitable default. But Canadians shouldn't worry, since it has happened before. It was called the Civil War.
Of course, there won't be millions dead, just millions of lost houses. Nowadays, war is fought by proxy, in this case, in Washington. The South voted for people with the slogan - No More Death or Taxes, having never heard the old expression, since the education system there is all religious. Everybody there knows about the Garden of Eden, and we can get back there again if we disavow all knowledge.
Canada never suffered much during the last Civil War. In fact, we did quite well with energetic refugees flooding in. There is the matter of my son in California, but they were never part of the US during that last war, and aren't a part of it now. They better not have an earthquake, though!
As usual, after years of bashing each other senseless, they will give up, and try to be sensible for a while. In the meantime, we will listen to all the slogans of war, demonizing the other side, calling them sub-human, etc. When you think about it, this new Civil War has been going on for some time.