The Louisiana Purchase
At the time of the Revolution, Napoleon was trying to create a military base in Louisiana so that the New Orleans port could be used to ship food to island Also France was in war with most of the European powers, so Napoleon was greatly in debt with all the costs of battles. When he lost control of the island, he decided: “No St. Domingue, no Louisiana” and decided to sell the territory to America at a very low price.
The American Civil War
The Haitian Revolution was the first successful slave revolt in the whole western hemisphere. The Revolution may have influenced some of the slaves in America as well. The addition of lands from the Louisiana Purchase would also lead to squabbles over whether to let new states in as free or slave states. So in some ways, the Haitian Revolution added to the growing tension between North and South which would lead to the Civil War.