I know only a little about US Soccer and almost nothing about Football outside the US.
What are the leagues? In the US, there is MLS, which only has US teams (That might change I guess). There is also MLB, which has US and Canadian teams.
But in Football outside the US, a league covers a whole continent? When a team from England plays a team from France, is it a championship type game? I hear names like "Manchester United", "AC Milan", "Arsenal" and "Real Madrid". These are all in the same league? Or these are just the most popular teams from different leagues?