Yep, and we suffer mightily because of it. We had 9 months of rioting this summer because of it. Entire cities were burned to the ground. Murder, arson, assaults, looting, all because of this thing called "diversity" which supposedly benefits us someone.
We suffer mightily because we are intolerant and cannot accept the possibility that those who are different from us are not necessarily our enemies. A large part of the blame for that rests IMHO with the democrats and their constant application of identity politics, which the GOP has adopted in response. The problem isn't in our diversity, it's in how we deal with it, and we aren't doing that very well. IOW, the problem is not limited to them, its US.