He didn't blaze trails through unknown territories
Explanation:
John Charles Frémont was an American explorer, military officer, and politician. He was popular as a US Senator from California, and in 1856 was the first Republican nominee for President of the United States
John C. Fremont was different from other explorers because he didn't blaze trails through unknown territories, but rather made maps of trails that were already there.
Being a senator was also one of his differences from other explorers.
