While writing the blurb below I noticed the AGEOD Website offers a trial version of Birth of America II: Wars in America 1750-1815 as well as sales of the full version of this turn-based strategy sequel. Here's a bit:

Birth of America II: Wars in America 1750-1815 follows the successful historical strategy videogame Birth of America, AGEOD's American Civil War and Napoleon's Campaigns. It is the long-awaited well-expanded sequel of the acclaimed first game that made AGEOD. You can now fight all the big wars that made America between 1750 and 1815.

Wars in America 1750-1815 is a stand-alone game not compatible with the previous one.