Anyway, Brooks says it a lot better.
We are bound together because we Americans share a common conception of the future. History is not cyclical for us. Progress does not come incrementally, but can be achieved in daring leaps. That mentality burbles out of Hispanic neighborhoods, as any visitor can see.
Huntington is right that Mexican-Americans lag at school. But that's in part because we've failed them. Our integration machinery is broken. But if we close our borders to new immigration, you can kiss goodbye the new energy, new tastes and new strivers who want to lunge into the future.
That's the real threat to the American creed.