whats weird about american civil war reanctments is they are also done in canada , uk , australia , sweden and even poland 
Where are they done in the US?
the original reanactment is done near manassas battlefield
Oh that's cool, when did reenactments start happening?
it is believed it began back in 1961 to 1965 civil war centennial commemorations 
Do they have like an organization that organizes them for people to attend?
the 125th Anniversary reenactment near the original Manassas battlefield, which was attended by more than 6,000 reenactors. That year, "Time" magazine estimated there were more than 50,000 reenactors in the U.S.
In 1998, the 135th anniversary re-enactment of the Battle of Gettysburg took place near the original battlefield. There have been several estimates on the number of participants, but it is widely agreed that it was the largest re-enactment ever held anywhere in the world, with between 15,000 and 20,000 re-enactors participating. This
Crenshaw said, "I did hear [their cover]. This group was huge in the UK, not so much over here, so I never really knew what they were supposed to be in terms of their musical style, didn't get why they'd done the song, but was still pleased about it. Somewhere in the world an A&R person was thinking about me and I didn't even know it; that's a cool thing'."