John Wesley Powell.
There have been about 15 billion who haven't explored the Mississippi.
they explored the Mississippi river in the year 1670.
explored Mississippi river and was an explorer
John Franklin mapped two thirds of the American coastline.
William Baffin was an English navigator and explorer who is known for his Arctic expeditions in the early 17th century. He is credited with discovering the waterway that now bears his name, the Baffin Bay, and made significant contributions to mapping the Arctic region. Baffin's explorations were important in expanding European knowledge of the Arctic and its geography.
French Jesuit Jacques Marquette explored the Mississippi River in 1673.
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Jacques Cartier was the first french explorer when he explored and mapped the St.Lawrence River.
They explored and mapped the western territory the United States just purchased.