State Fair is established at Douglas. 1906 Riverton townsite is thrown open to settlers. First auto accident in Wyoming occurs. Devil's Tower National Monument is established. 1909 Pathfinder Dam is completed.
Park County is organized.
1910 Population, 145,965. Willis Van Devanter of Wyoming is appointed associate justice of the U. S. Supreme Court. Colonel Theodore Roosevelt visits Cheyenne Frontier Days Celebration. Campbell, Goshen, Hot Springs, Lincoln, Niobrara, Platte, and Washakie Counties are organized. 1913 First automobile license in Wyoming is issued to J. M. Schwoob.