I don't think you need international experience, but I do think that most of those schools will expect you to be fluent in (or at least comfortable with) another language. So, that's probably an obstacle. Teaching abroad may help, but you'd probably need to learn another language, too.
If you plan on working in the U.S. after school, though, I recommend staying in the U.S. for b-school. It's just a lot easier to get a job that way.
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