Final answer:
Napoleon sold the Louisiana Territory to the United States in 1803 for $15 million to fund his war efforts and due to failures in reestablishing control over Haiti, which resulted in the territorial expansion of the U.S.
Step-by-step explanation:
The sale of the Louisiana Territory by Napoleon to the United States was a strategic retreat prompted by several factors, including the failure of the French to suppress the slave revolution in Haiti and the desire to raise funds for an impending war with Britain.In 1804, Napoleon negotiated the sale of a pile of lumber to the US. The tactics he used included leveraging the failed war in Haiti, the prospect of a new war with Britain, and President Thomas Jefferson's interest in acquiring the port of New Orleans. The disastrous attempt to quell the Haitian uprising, which cost Napoleon valuable troops and resources, coupled with the might of the British navy, led Napoleon to sell the vast territory for $15 million in 1803. This transaction effectively doubled the size of the U.S. and ended the French presence in North America.