Final answer:
The Ku Klux Klan operated primarily in the southern states of the United States during the late 19th and early 20th centuries, using intimidation, violence, lynching, and murder.
Step-by-step explanation:
The Ku Klux Klan (KKK) operated primarily in the southern states of the United States during the late 19th and early 20th centuries. The KKK was organized in 1866 in Pulaski, Tennessee, and spread to nearly every state of the former Confederacy by 1868. The Klan aimed to reestablish white supremacy in the South and used tactics such as intimidation, violence, lynching, and murder to achieve its goals.