Supreme 55: "Possibly The Most Controversial Story You'll Read All Year!" (in 1997)
One morning, Supreme notices that the world seems to be somewhat different this day...
Their flagship character, as it turns out, is a white-hooded character called the Klansman.
Supreme (who notices that people are calling him the Supremacist) travels outside of time to investigate what's going on. There, he bumps into his centuries-spanning teammates in the League of Infinity.
Basically, Bill Hickock fell in love with a Southern woman named Jessie Hazel. After she rejected him, he tried to prove his love by altering history so that the South won the Civil War.
That's League of Infinity member Achilles in the final panel background above. One thing I could never figure out: Where did the gun come from? The team's period clothes are a magical illusion Witch Woman conjured up.