This whole idea that we're the first multi-ethnic civilization in history, is just stupidity. It's a hallmark of our ignorance. Undeniably, I would argue that America is probably the most progressive civilization in human history, in terms of legislating non-discriminatory law. I think that would be a fair thing to say.
But the Muslims; For pre-modern records, nobody compares to the Muslims. And I say that objectively, as a student of history. I think Toynbee and others would also make that point.