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 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
American Civil War reenactment
American Civil War reenactment is an effort to recreate the appearance of a particular battle or other event associated with the American Civil War by hobbyists known (in the United States) as Civil War reenactors, or living historians.
Although most common in the United States, there are also American Civil War reenactors in Canada, the United Kingdom, Germany, Australia, Italy, Denmark, Sweden, and Poland.
History.
Reenacting the American Civil War began even before the real fighting had ended