Hitler was a dictator who took pleasure and found satisfaction in the feeling of control. In his mind, the world would flourish and benefit if all of man was the same. This was the mentality and the leadership that lead to the Holocaust.
Progressivism ended with WORLD WAR 1
For starters marraige between a white and a black were illegal, they were forced to do cheap labor, they couldnt own certain land being homeless was illegal for black people, they couldn't vote and was still heavily segregated