ANSWER:
Hernando de Soto was the explorer who sought wealth but found the "Mississippi River". He was the first European to do so.
Step-by-step explanation:
- He was a "16th century Spanish explorer" who made fortune by trading slaves from Central America.
- De Soto set out on an expedition for glory and riches to conquer Florida and reached the Mississippi River.
- He and his men travelled almost 4000 miles when they encountered the Mississippi River and crossed it.