Three new boxed sets are available to pre-order (release coming in April 2021) from Warlord Games for Black Powder Epic Battles which takes things down to 15mm scale. If you wanted more American Civil War then the folks at Warlord are delivering with new infantry and cavalry.
The Iron Brigade // Warlord Games
The first of the sets, The Iron Brigade, offers up a whole bunch of infantry for you to use in your games. Also known as the Black Hats, this was an infantry brigade that became part of the Union Army Of The Potomac. They were known for their distinctive uniform and strong fighting prowess.