Since this covers about an entire century. The Imperial Conquests range can cover a lot.
So admittedly I've been wondering just how many different era kits can be adapted to this era. WW1 minis seem like an obvious one, but I've been wondering about Napoleonics...... mainly just the British Riflemen. I've also been wondering if the WGA British Riflemen wouldn't look out of place fielded alongside Warlord Game's Black Powder American Independance Artillery.
@Charles Tottington the The Sharps Riflemen set actually would look out of place everywhere practically but the Napoleonic era timeframe and maybe some actions in the decade just after maybe.
British and Americians tended to change their uniforms every decade for every theater practically after the early 1700's, if one wanted you could do a 19th century line thats just British in diffrent uniforms of the timeframe and have a diverse bunch of guys (they would not even have the same guns half the time). the AWI happend in the 1770's so I am not even sure if the cannon from American War Independance would work with the British Rifle, but the crew would for sure look out of place, that said Victrix does Nappy Artillery.
That said though you can use the Afgahns for almost any conflict from the 19th century they where involved in as is at least and maybe sub in for east indians for the later actions in the Sharps Rifles book series.