It seems like there was a largely unspoken agreement among the wealthiest in the West throughout the middle of the 20th century, particularly in the aftermath of the Depression, World War II, and the rise of communism, that they wouldn’t try to extract the absolute maximum of wealth from the workers and try to keep a stable, happy middle class and even lower class that had a relatively comfortable existence without feeling too at risk of losing everything.

Actually, the richest people in America were terrified of FDR and the New Deal, and even attempted a fascist coup in order to overthrow him. Fun fact, George W. Bush's grandfather, Prescott Bush, was implicated in it!