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.
he explored in the arctic/ he was an explorer Baffin mapped the entire Baffin island
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.