Of course U.S. Immigration sucks for founders. You don't think we're actually pro sensible-immigration, do you? The U.S. Immigration system is about importing cheap labor (which is why Republicans support it) and NAMs to replace whites (which is why Democrats support it).
50% of the children in born in the U.S. today are Black or Hispanic.
Unless you know of a way to fix all the problems in Black and Hispanic populations that seem to keep them from having any significant presence in professions requiring an education or IQs over 120 (and we've tried to fix those problems for 150 years now), the U.S. will be Brazil in 20-30 years.
Educational reform has moved the Black-White gap maybe 1/5th of a standard deviation over the last several decades. And that was the easy part. Honestly, the rest is probably genetic, and simply won't budge even if you turn the public schools into sharashkas.
Good luck, all. The demographic ball is too big to stop now, even if every state turned into Arizona tomorrow. The moving hand has written. Enjoy your bowls of red.
P.S.
If you are now busily writing me 50 reasons why the black-white gap isn't genetic, don't bother. That was an aside and irrelevant to the central point. What matters is that it's something that seems impossible to shift with current methods even when vast resources sluice against the problem over many years. And you only have 20-30 years to come up with a solution. Smart money is way against you.