Adding to this, there are chapters of Democrats Abroad in nearly every city of size. They will help with registering and are good for socializing

There is the electorate of a small state overseas, not counting the military. Each voter, though, votes in their state of origin. A couple of years ago they experimented with computerized voting. Not sure if they still do that.

Wait, non-military Americans who live in other countries can vote for president but Puerto Ricans can’t? That’s fucked.