It has absolutely nothing to do with race! It’s about CULTURE. You cannot preserve the American culture—such things as individual liberty, self reliance, and faith in God—when you import people who stand in direct opposition to American values. Sharia is simply incompatible with liberty, and South American socialism is incompatible with self reliance.
Actually it has more to do with the culture being imported is firmly tied to a medieval religion. Witness Bosnian and Chechen turmoil. Those people are Caucasians and just as terroristic as ISIS. One can learn a new culture just like you can learn a new language. It has been done for millennia. The Romans brought their culture all through the known world just like the Greeks before them.
Race is not the issue. The antique inhuman religion is.
Borders, language and culture.