In San Francisco high schools, the fight is between Filipinos and Samoans. As I see it, the mingling and the mixing of race is a sign that we are evolving toward a higher, more integrated state as a culture. The smaller the differences are between people, the more they insist on them. Anthropologists have long observed that as people and cultures evolve, they become more and more distinctive. They don't shed the qualities that make them unique, they refine and develop them.
Diversity appears to be a function of social evolution.
Of course, diversity doesn't mean a thing if it doesn't challenge us to be more open-minded and inclusive. All too often, what passes for diversity are merely brown, black, and white versions of the same political ideology. There will always be those who overemphasize our diversity and fail to appreciate our essential unity, just as there will always be those who overemphasize our unity and fail to recognize the virtues of diversity. It's a delicate balance. When the founders laid out America's first principles two hundred years ago, they took inspiration from the Iroquois Indian Confederacy.