After the Civil War, the Confederate Battle Flag changed into adopted through a couple of communities, including the Ku Klux Klan

https://erickescx850.publishlane.com/posts/historic-reenactments-the-role-of-the-confederate-battle-flag

After the Civil War, the Confederate Battle Flag became followed via various communities, adding the Ku Klux Klan, which modified its that means into one associated with racism and segregation.