Edited

The reason is very simple. The white folks with money did not want to share it with the poor black folks. They did not want to go to public hospitals with black patients. they did not want public transportation with black folks. they did not want public education with black folks.
During the time after WWII while Europe was becoming socialist, America was still segregated.







"The United States is a special case. There is a whole shelf of books on the question of why socialism never became a real mass movement here. For decades, the word served mainly as a cudgel with which conservative Republicans beat liberal Democrats about the head. When Barry Goldwater and Ronald Reagan accused John F. Kennedy and Lyndon Johnson of socialism for advocating guaranteed health care for the aged and the poor, the implication was that Medicare and Medicaid would presage a Soviet America. Now that Communism has been defunct for nearly twenty years, though, the cry of socialism no longer packs its old punch. “At least in Europe, the socialist leaders who so admire my opponent are upfront about their objectives,” McCain said the other day—thereby suggesting that the dystopia he abhors is not some North Korean-style totalitarian ant heap but, rather, the gentle social democracies across the Atlantic, where, in return for higher taxes and without any diminution of civil liberty, people buy themselves excellent public education, anxiety-free health care, and decent public transportation."