Final answer:
The Haitian rebellion of the 1790s indirectly led to the Louisiana Purchase (a), as the revolution ended France's American ambitions, allowing the U.S. to acquire the Louisiana Territory at a bargain, which doubled its size and influenced the national debate on slavery.
Step-by-step explanation:
The Haitian rebellion of the 1790s prompted a) The Louisiana Purchase. This connection between the rebellion and the Louisiana Purchase is anchored in the geo-political consequences of the uprising. The Haitian Revolution, which was a significant slave rebellion leading to the establishment of Haiti as an independent nation, undermined France's ability to hold onto its American territories. Consequently, Napoleon abandoned his ambitions in the Americas which led to the selling of the Louisiana Territory to the United States in 1803. The acquisition of this massive territory doubled the size of the United States and was a pivotal moment in American history. It is also notable for exacerbating debates about the expansion of slavery into new American territories.
The turmoil in Haiti and the subsequent loss of French control over its most profitable colony meant that maintaining the vast and resource-rich Louisiana Territory was no longer viable for France. This fortuitous circumstance for the United States resulted in the advantageous Louisiana Purchase, a significant expansion and a major event in American territorial history that set the stage for future westward expansion and debate over slavery.