The difference between the US and Europe is that the US has a smaller percentage of its land actually cultivated, less than the African continent in fact. It's quite empty, even the cultivated bits are famous for being huge swaths of farmland and virtually no people.
It's a miracle that they actually manage to find and locate as many people as they do.
That said as far as I am concerned I'd prefer the immigrants to come here to make something out of their lives and supporting them to accomplish that than just attempting to shut the gates on every economic immigrant for example. The former is productive, the latter is at best nothing but whistling past the graveyard and at worst horrifyingly destructive, degrading and impotent to boot.
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