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Sounds like a good idea. I think they should stay in Mexico to do it and build a supernation. But it won't happen because of nature and culture. Importing that deficiency into the United States isn't smart.
Frankly, I'm as concerned about Mexicans as they are about me. I see no advantage to me in opening uour borders. To the extent it has been done illegally, it has been detrimental. There is nothing in Mexico I find appealing. Bringing it here doesn't improve it.