<p>I have two inlaws who are native born US citizens living abroad. One left the US as an infant and has never resided here since. The other left the US as an adult, after having resided in several different states as a child and adult. Both are registered US voters in their state of last residence (which in the case of the first mentioned is his birth state, and in the second case, not his birth state but the last one in which he resided before emigrating). For voting purposes it seems expats always have a state. However for college tuition it sounds more tricky, per GMT.</p>