White Supremacy 

The belief that white people are superior to those of all other races, especially the black race, and should therefore dominate society.

Psuedosceintific beliefs

Became popular in the 1860s

In some parts of the United States, many people who were considered non-white were outcasted.

Rose again in the 1920s

Civil Rights movement in the 1960s

Its height had 4 million plus followers.