Who was John C. Freemont? Why is he important?

American military officer and an early explorer and mapmaker of the American West, who was one of the principal figures in opening up that region to settlement and was instrumental in the U.S

Explanation:

Frémont, in full John Charles Frémont, (born January 21, 1813, Savannah, Georgia, U.S.—died July 13, 1890, New York, New York)

John Charles Frémont (1813-1890) was an American explorer, politician, and soldier. Through his explorations in the West he stimulated the American desire to own that region. He was the first presidential candidate of the Republican party.

Explanation:

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