Women entered the work force and split their husband's wages. We started throwing trillions down the black hole that is the welfare state. We allowed big business to offshore, exfiltrate, and insulate themselves. In a nutshell: everyone raided the prosperity of America simultaneously, mostly under the guise of feminism, social justice, and globalism, and that coalition of leftists and moneyed interests have been running amok ever since. Demographic reform was mostly about destroying the white men who would've fought back.