I agree with Henry generally but if you take 18th century out and you already have Napoleonic and ACW out then what is left? Isn’t this de facto the 18th century forum.
Maybe it might be better to put some dates in, not just here but elsewhere. Have this forum for say 1700 to 1785. Napoleonic is everything 1785 to 1840 (???) and ACW is everything from 1840 (or whatever you choose) to 1900. So change the names to, for example, Napoleonics (1785-1840).