It could be like the Civil War map, but with the Thirteen colonies and some British ships on the coast, maybe indian bonuses in the west.

Just pointing out a little historical inaccuracy: in the Era of the Three Kingdoms, the Wei Kingdom was more powerful than either of the other two.
Still......can't wait to play it!

Okay so here it is:
1. When you annihilated someone with artillery (bombardment) you convert that territory to neutral.
2. This problem is probably because your square/something is a cavalry unit. Cavalry can attack up to 2 squares away from their original square. It's actually pretty usful ...