Let's make simple calculations. In California, near the start of the 20th century there were more than 34 million native Americans living in what was their land. Now there are in California 300-700.000 native Americans.

They were exterminated and replaced by a very small European population. Like sterilising a Petri dish and letting bacteria grow, the opportunities that population experienced were the biggest any population in the world ever had. Just look at a graph of the population growth of US OR California in the last century and compare it to others.

Now there is in California a population of near 40 million people.

That is not a "mindset", this is real growth that they could experience and the rest of the world could not.