Bill' Carlisle, train bandit, escapes from penitentiary. 1920 Population, 194,531. Transcontinental air mail planes are launched. Night air mail flying is inaugurated across Wyoming. 1921 Great oil well roars in at the Teapot Dome.
Prize fighting is legalized in Wyoming.
Teton and Sublette Counties are organized. 1922 Union Pacific stores six months' supply of coal along tracks as a precautionary measure in strike situation. Governor William B. Ross dies in office. Frances Warren Pershing Memorial Hospital is dedicated in Cheyenne. 99 coal miners die in explosion at Kemmerer mine.