International applicants selection

Hi,

I'd like to ask you an important question about the B-schools selection process. I'm wondering whether applicants are really selected according to their nationality. I've often heard that for instance, in a MBA class, 60% would be exclusively American people, the rest being international applicants. As regards this slice, are there slots for each nationality (for instance, 10% of the seats for Chinese people, 10% for Indians, etc)? In other words, will an European applicant compete with all the pool of candidates, or only with other Europeans? I've never known whether this "slicing" of participants according to their origin was a myth. But this would make sense if you consider that B-schools like diversity among their classes, so they would probably not only admit American people even though, for instance, they happened to be the brightest candidates of a session.

Thanks in advance,
Mark