Michael Moore (if you haven't heard of him go and read about the movies he has done) made a cartoon about the history of the US. He created it when he made the documentary 'Bowling for Columbine'. I'm note sure it was ever aired, and I've heard that it has been banned.
Watch it but keep in mind that It's made by Mickael Moore and that, as so, it is biased!
( And if you read the comments under the video, you'll see that many people disagree with M.Moore)