René-Robert Cavelier, Sieur de La Salle (/ləˈsæl/, French: [ʁəne ʁɔbɛʁ kavəlje sjœʁ də la sal]; November 22, 1643 – March 19, 1687), was a French explorer and fur trader in North America. He explored the Great Lakes region of the United States and Canada, and the Mississippi River. He is best known for an early 1682 expedition in which he canoed the lower Mississippi River from the mouth of the Illinois River to the Gulf of Mexico; there, on April 9, 1682, he claimed the Mississippi River basin for France after giving it the name La Louisiane, in honor of Saint Louis and Louis XIV. One source states that "he acquired for France the most fertile half of the North American continent". A later, ill-fated expedition in 1684 to the Gulf coast of Mexico (today the U.S. state of Texas) gave the United States a putative claim to Texas in the purchase of the Louisiana Territory from France in 1803; La Salle was assassinated during that expedition.
Although Jolliet and Marquette preceded him on the upper Mississippi in their journey of 1673–74, La Salle extended exploration – and France's claims – all the way to the river's mouth, although the existing historical evidence does not indicate that La Salle ever reached the Ohio/Allegheny Valley.
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