[Amnorix]

I'm not familiar with any good Civil War era board games at all, really.

Axis and Allies has many variants, but I'm only used to take-offs on the normal rules, not the introduction of wholly new units. I believed WoTC (Wizards of the Coast) bought out Hasbro or whoever, and is pushing the old games like A&A again, so I wouldn't be surprised if they modified/updated it.

The other two games that Milton Bradley or Hasbro or whoever put out along with A&A were Fortress America and some kind of Samurai game. Fortress America was pretty good, but in some ways inherently frustrating. I never played the Samurai thing.

A good tabletop game that you might like is Wooden Ships and Iron Men.

There, of course, many board an computer games which are more advanced than A&A with regard to building production and turning it into military units. The rules tend to get more and more complex.