That is the one thing I really love about American culture; once you become a naturalized citizen, you are on Team America. Does not matter where you are from or what you look like, once you take that oath to the Constitution, you're in.
Americans ask precious little of immigrants: learning the language, waving the flag, etc. In contrast, in almost every country where there is a majority of "brown people," there is nothing a foreigner can do to integrate. Had the situation been reversed, and I was an American immigrant to Bangladesh, people would always stare at me and call me "bideshi."
Yup, that's why we've never had a brown president.