Unless you're brown. Or gay. Or Muslim. Or don't speak English.
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.