I believe it happened once, during the Great Depression.
Of course, America is soft now.
So soft, I believe I heard that the families of those illegals who were deported during the Great Depression are bringing suit.
They will either be assimilated under our terms or under their terms....one way or another. We're talking about millions of people who will either be part of the mainstream or part of a subculture feeding the underground economy and draining the national economy. And if they are not educated or given health care, they will become unhealthy criminals preying off the rest of us to survive.
Gee.
Too bad Japan and Germany didn't figure that out.
Then all they would have had to do to win WWII, was stroll across the border, get jobs, and demonstrate.
Is that you solution? Gee?