Marcus Epstein: "Diversity can be good in moderation -- if what is being brought in is desirable. Most Americans don't mind a little ethnic food, some Asian math whizzes, or a few Mariachi dancers -- as long as these trends do not overwhelm the dominant culture."

In other words, we don't mean America has to be literally 100% white so long as the outsiders stick to marginalized and degraded roles in kitschy entertainment and ethnic cooking.