I have been thinking about a timeline in which the United States diverges early in its history and spreads throughout North and South America as well as throughout the world. I decided that instead of some major PoD, I would use a change in philosophy during the early years of independence to change the way America viewed itself and the world and thus its history.
1783- The United States gains independence from Great Britain and gets all the land it did in OTL.
1788- French and Prussian advisors come to America upon request from the U.S. ( U.S. realizes it needs protection from the British, should another war come over the northwest territories and leaders would like to annex Canada art some point) for restructuring of the military. The French and Prussian commanders help train U.S. troops to put them more up to European standards. Since France sees no immediate threat to them by training the Americans, they decide to do this in case France is ever involved in a war with England again. This strengthens the alliance. The French also sell a few ships to the U.S. and help them build a navy.
I will post the rest later, I have to go to class.