The popularity of inflammatory anti-immigration rhetoric aside, it appears that Americans are none too concerned about preserving a homogeneous national identity:
In contrast, Europeans, to varying degrees, would rather just have more of same. A neat new paper scopes out attitudes toward immigration and immigrants in the U.S. and Europe. Responses to a pair of statements are plotted above, with a pretty clear showing for American cultural and religious openness and love of diversity:
It is better for a country if almost everyone shares the same customs and traditions.
It is better for a country if there are a variety of religions among its people.
More on immigration here.
Via Matt Yglesias