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.
Mississippi River
Marquette and Joliet explored the upper Mississippi River for France. Previously, La Salle claimed the Mississippi River Valley for France.
Robert de La Salle is the French nobleman who financed his own expedition along the Mississippi River Valley. He also claimed all of the land that he came across for France.