People call the USA, America. Sure, if you want to be picky, you can say there is more to America but I woudn't call a Canadian an American, even though they live in North America.
Not perfect, but here's a poll http://forums.poxnora.desertowlgames.com/index.php?threads/a-poll-of-represent.278/
USA here, surprised how many are outside of the US. Will be interesting to see how your connections are.