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How did the Louisiana Purchase give the United States control of the Mississippi River basin?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Map of the United States showing the Mississippi River and its major tributaries flowing south from Minnesota to the Gulf of Mexico. A shaded area marks the Mississippi River basin, and New Orleans is labeled near the river's mouth.
Mississippi River

The Louisiana Purchase of 1803 was a pivotal event that secured United States control over the western half of the Mississippi River basin.1

Before the purchase, the United States faced significant economic and strategic uncertainty regarding the river. American settlers in the Ohio and Tennessee river valleys relied heavily on the ability to ship goods through the port of New Orleans and navigate the Mississippi freely. When Spain revoked the U.S. right of deposit in New Orleans in 1802, tensions rose, and the U.S. government feared that France—the new, more powerful owner of the territory—might close the river to American commerce entirely.1

By acquiring the Louisiana Territory from France, the United States gained sovereignty over the strategic mouth of the Mississippi and the vast western lands of the river basin. This transfer eliminated the threat of foreign interference at the port of New Orleans and ensured that the "Father of Waters" could serve as a vital, unobstructed artery for American trade and westward expansion.213