Why are so many "global" people liberal whilst so many "domestic" people lean right?

What I am referring to is the population I meet here in a very diverse city. Most of the people I know who speak several languages, have studied/lived abroad, travelled widely and have many international friends, tend to be of a more liberal bent politically, whereas most of the people I know who have never been outside The United States, don't speak other languages besides English and ociate mainly with their own race, creed and color, tend to be very patriotic, very proud of America and rather disparaging of other societies. Why is this? Wouldn't it follow that these "cosmopolitans," having lived abroad would have a great appreciation for the opportunities and freedoms in America, whereas those who don't venture outside America might fantasize that there's something better out there?