There are several groups that re-enact Dragoon units, but uniforms and equipment to outfit a Dragoon gets kinda expensive, with relatively few outfitters offering much to prospective buyers - forcing them to go to high-end sutlers, but on the other hand - they wind up with very high-end, accurate equipage...
Most of this is done more locally, than on any sort of national level - with folks honoring their forebears' experiences.
Plus - these events chronicled late Fur Trapping, Westward Expansion and the Gold Seekers - all of whom were pointed towards a focused goal, where Indian encounters varied wildly - as did actual warfare.
I'd lump the Anti-Slavery Movement in with the Civil War reenactments, though - their activities are too intertwined to separate them into a their own category.
There's also the fact that for many in the C&WAS arena - these actual historical events aren't nearly as interesting nor exciting as the shoot 'em up version of 'history' as played out on the Silver Screen.
Folks re-enact 'everything', today - even down to Great War trench warfare, through to Vietnam...
Vaya,
Scouts Out!