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So let's be real here as bad as USA was in cold war it's not "these countries" as if all or most it's some.
Most are fleeing completly lawless countries that are being run by gangs and drug cartels. Others are fleeing cripling poverty. For them its a choice of  Illegaly immigrating into the US seeing your entire family die. If you can solve those two problems and youll drastically reduce illegal immigration . >

It would have helped if the US hadn't intervened in these countries thereby destabilizing them which contributed significantly to the conditions these countries now have.