The answer is yes. He did claimed the Mississippi River.
France
Louis Joliet
his results were that he claimed the Mississippi river valley.
Robert La Salle
La Salle claimed the mississippi river valley for france
The Mississippi River valley
The Ohio River valley, the Mississippi river valley, and the entire great lakes region
A french explorer who explored the mississippi river valley. He claimed the land for his king.
The French explorer who claimed the Mississippi Valley for France was René-Robert Cavelier, Sieur de La Salle. He traveled the Mississippi River and, in 1682, claimed the entire river basin for France, naming it "Louisiana" in honor of King Louis XIV. La Salle's expeditions significantly contributed to French exploration and colonization in North America.
Marquette and Joliet explored the upper Mississippi River for France. Previously, La Salle claimed the Mississippi River Valley for France.
The explorer who claimed the Mississippi River valley for France was René-Robert Cavelier, Sieur de La Salle. In 1682, La Salle traveled down the Mississippi River and reached its mouth, where he claimed the entire river basin for France, naming the territory "Louisiana" in honor of King Louis XIV. His expedition played a crucial role in expanding French influence in North America.