Where is the final or is it a two legged affair? It's a quite old tournament as well I think.
In terms of where the final is held, there is no neutral venue in the US like Wembley is in the UK. It's always played at the home ground of one of the two finalists. The two teams used to have a sealed bid contest to win the right to host the game at their own stadium, but since 2013 a coin toss has determined which team gets to play at home. Same goes for the semi-finals.