Yeah, the stadiums being used were all built for American football after the Astroturf era thankfully ended or after an owner threatened move the team, none were built for the World Cup, there are stadiums for MLS Soccer but none of them are big enough to use.
The funniest thing about this World Cup is that people are somehow shocked that country as rich as USA built some good stadiums for it and they pretend its some kind of a miracle.