Regardless of the initial motivations for the 14th amendment, it was interpreted very early as extending a broad birthright citizenship: http://en.wikipedia.org/wiki/United_States_v._Wong_Kim_Ark. And the fact is that the US has abided by it and extended citizenship to people born on U.S. soil in a way France or Germany or any of the other countries who get snooty about U.S. foreign policy never have. Those countries are quite content to have large number of people born on their soil that can't claim the privileges of citizenship (though their attitude is better now than it was in the 1970's or 1980's).

My brother was born just a few months after we immigrated to the U.S., and he was a U.S. citizen right off the bat, as much a citizen as anyone else and eligible to run for President. That wouldn't have been true in any Western European country.

To me, that suggests a pretty liberal attitude towards outsiders, i.e. making it tremendously easier to transition from being an "outsider" to no longer being an outsider.