The Verendryes and companions are first white men to sight the Big Horn Mountains in Wyoming. 1805 General James Wilkinson is appointed governor of region embracing Wyoming. Ezekiel Williams heads trapping party that enters Wyoming.
Many white trappers operate in what now is eastern Wyoming.
Wilson Price Hunt 's party, employed by John Jacob Astor , crosses Wyoming. General William Ashley establishes trading post on the Yellowstone, Jim Bridger arrives with Ashley. 1824 Ashley party names Sweetwater River. South Pass is crossed by Ashley trappers, headed by Thomas Fitzpatrick and Jedediah Smith. General Ashley sells his trapping interests in Wyoming.