You can manually in the edit mode, quite comprehensive. And there is the Copa Santander Libertadores, but no American Soccer League, at least in the European version. Fantastic game, though. Online is pretty good too.
Lol, if everyone would think like that, nobody will get it! Just joking. I've got it, and I think it's an excellent game, online is very good too, but at the moment it's a bit hard finding matches, especially during the week. It'll get better once is out in the rest of the world, and more people find out about it. Btw, I don't have fifa 12, but I've been told framerate is not that good, and graphics are a bit jaggy, did you find that?