Most states have had anti-duelling laws since the 1830s or so.
They were honored more in the breach than the observance before the Civil War, but the postwar period pretty much brought duelling to an end by destroying the culture that supported it.
Nowadays, most states still have the laws technically on the books but have not bothered to publish them in successive Code revisions because nobody is interested in duelling any more (because the culture that supported it is "gone with the wind".)
Georgia's anti-duelling law is still technically in force, but no longer in the published Code. I've got a copy of it lying around somewhere.
Yeah...
Drive-bys are all the rage now!