Colleges do have a significant amount of international students, but the high number is actually in part because they pay more for tuition - it's a good revenue

Colleges do have a significant amount of international students, but the high number is actually in part because they pay more for tuition - it's a good revenue source for colleges. The percentage rises and falls over time for related reasons. The percentage also rises with higher degrees - people often finish their undergrad in their home country, then go to the US for their graduate degree. But undergrads are the bulk of college student bodies. So overall, most college students in the US are from the US.