His first two published federal expeditions launched a mass emigration into the American West producing maps and reliable reports for settlers to read and follow.
[2] Frémont's published works, co-authored by his wife Jessie, could either be read scientifically or as adventure stories, capturing the public's attention, and creating enthusiasm for Westward migration.
[4] After his college dismissal, eminent South Carolina politician Joel R. Poinsett came to Frémont's aid, who secured him an appointment as a teacher of mathematics aboard the sloop USS Natchez.
[7] In July 1838, Frémont was appointed second lieutenant in the U.S. Army Corps of Topographical Engineers, accompanying Nicollet on two successive expeditions, ending in 1839.
[6] Frémont gained valuable wilderness experience under Nicollet becoming a first rate topographer, trained in describing fauna, flora, soil, water resources, astronomy, and geological observation.