This AH challenge is a little bit different than other ones, because it is an Ameri-wank in a different way. Your challenge is to make America one of the most morally upright nations in history. For example, banning slavery as early as possible is a must, being anti-imperialist would help drastically, and a much, much better policy towards native americans is also a must. Going to war against other 'evil' nations would also be good. Go!
Edit: And I just realized this is in the wrong forum. Doh!