Is it any surprise that as a society becomes more populated by Africans that it starts to resemble Africa?
We're crossing over issues here.
Do populations diverge based on evolutionary paths taken? Of course. Does this lead (hypothetically) to one population that went north developing higher intelligence and a raft of other features, including morality and social skills, that those who stayed behind lack? Surely.
But that's not the issue here.
The issue here is that nationalism is the only way to have shared actual values in a population.
Anything else is a nanny state imposing happy rules. Culture trumps bureaucracy.
And until we have nationalism, our societies will be directionless and self-consuming.
Time wasted on hating black people is stupid. Black people are what they are, but they're also facing a bad hand in this country -- dealt by diversity in all of its hypocritical, foolish forms. They are a de facto permanent underclass. That sucks. They'd have fewer material things at first but more self-respect and a future in Africa.
Ditto every other non-Western European group in North America.
If we persist on this path, we get the archetypal third world country: low IQ masses in slums, cynical leaders, no culture and thus, nothing except a me-first attitude, which eventually through evolution pares the population down into a herd of not very productive people. You can't recover from that, which is why the third world remains third world.