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The French claimed it. Explorer Jacques Cartier discovered, named and claimed the St. Lawrence River for France.
Jacques Cartier was a French navigator who explored and claimed for France. He was the first European explorer to discover the St. Lawrence River.
Me
France
Louis Joliet
Jacques Cartier
La Salle claimed the mississippi river valley for france
England and France
The Mississippi River valley
Beginning French exploration efforts along the St. Lawrence River, Jacques Cartier claimed much of this region for France.
The answer is yes. He did claimed the Mississippi River.
First France, then it was given to Spain, then back to France again, and it was then sold to the United States which still has possession of it.