As the picture in the thread above shows, even the early 20th century KKK used the US flag, not any Confederate flag.
For example, the Confederate battle flag was only incorporated into the Georgia state flag in 1956, following Brown v. Board of Education.
![](https://upload.wikimedia.org/wikipedia/commons/8/84/Flag_of_the_State_of_Georgia_%281956-2001%29.svg)
The black mayor of Atlanta was so infuriated by the state flag (well, agitated by the NAACP, more like it) that he took it down, and I saw to my surprise a giant Georgia State flag from the 1920's, the flag of hard-core Jim Crow Georgia, floating over Hartsfield International Airport as a substitute for the flag under which all of the civil-rights movement's gains had been made, the flag if you will of "moderating" Georgia.
Just a reminder that, when you're white, you're always still too white for some people.
Now the state flag is a Confederate National (1861) with a Georgia state seal in the middle of the union of 13 stars.
Very clever.