The roots go back further than that to the leftist intellectuals of the 20's and 30's and the extremely successful efforts of the Soviet Union and the Communist Party to infiltrate our cultural and political institutions. What you see now is a natural result of a nearly 100 year effort initiated by Marxists that has resulted in leftist control of our educational institutions, our media and our political leadership.
Goes back even further:
“...and dedicated to the proposition that all men are created equal....”
It goes all the way back to Cain and Able. Cain who figured he could get all of his brother’s gain, just by bumping him off.
...and prior to that, one “son of the morning”, called Satan, who figured he could bump off God and collect all the glory.
The more things “change”...both of the above got their reward.