Federal States of America

Point of Divergence
At the Philadelphia Convention (25 May to 17 September 1787), slavery and the slave-trade were outlawed in the new constitution, leading to three states (Georgia and the two Carolinas) not joining the new union and thus remaining governed by the 1777 Articles of Confederation.

1812
The Napoleonic Wars spread to the Americas. The Great War of 1812 pits the "Northern" United States eventually backed by France against the "Southern" United States backed by Great Britain and her allies.

The antagonistic relationship between the North and the South comes to a head when the first shot is fired on 18 June 1812. The war ends in a stalemate with the signing of the Treaty of Ghent on 23 March 1815. All told: 44,745 are killed in action, 90,860 are wounded, and 136,660 (a full 2% - or 1-in-50) total are dead.