Which of the following became the largest and most powerful white supremacy group?

the Ku Klux Klan

the White League

the Red Shirts

Knights of the White Camellia

The Ku Klux Klan

The Ku Klux Klan became the largest and most powerful white supremacy group.

Explanation:

White supremacy is the racialist idea that white people are superior to people of other cultures and therefore should be ruling over them. White supremacy has origins in the now-discredited theory of scientific segregation and often relies on pseudoscientific reasons.

The Ku Klux Klan started as a vigilante organization of previously associated soldiers trying to frighten once slaves and other blacks after the Civil War. The society recognizes itself today as a Christian "civil rights for whites" organization. Loyal White Knights are one of the greatest and most powerful Klan groups in the United States.