I'm from Dallas.  I can say firsthand, foreigners are pretty common, even not counting Latin Americans.  Especially in colleges.  My first class in college, native-born Americans were actually in the minority, and of my five closest acquaintances in that class, three were born outside the US, and one was a first-generation American.

At my High School, Americans were in the majority, but even still, there was a noteworthy population of kids from outside the states.