In 1903, President Theodore Roosevelt included Wyoming in his 25-state tour of the western United States. He spent nearly three weeks in Yellowstone National Park, gave a speech in Newcastle, and on the return leg from California, left the train long enough for a well-publicized horseback ride from Laramie to Cheyenne, and two extra days politicking and socializing in Wyoming’s capital.

When completed in June 1909 on the North Platte River, 47 miles southwest of Casper, the granite Pathfinder Dam was a triumph of early 20th century design. It was one of the earliest federal Reclamation Service dams in the West, and convinced agency officials of their ability “to do great things.”

Rock Springs, Wyo. traces its origins to a coal mine established there in 1868 to serve the still-building Union Pacific Railroad. Ever since, the town has been enriched by the people who came from around the world to live and work there—in coal mines, on the railroad and, in recent decades, in trona mines to the west and the oil and natural-gas fields to the north. Rock Springs boasted 56 nationalities by the 1920s. Its political and economic fortunes have closely followed all these industries’ cycles of boom and bust.

In 1908, Albert P. “Prof” Sommers established his ranch headquarters on property southwest of Pinedale, Wyo. Three generations of his family have lived and ranched here. When Prof died in 1928, his widow, May, continued to own and operate the ranch. She also served as Sublette County superintendent of schools. She sold the ranch to her son, Albert, in 1947. The property is currently owned by Albert Sommers, Jr. and his sister, Jonita. The ranch is listed on the National Register of Historic Places.

Point of Rocks Stage Station, 25 miles east of present Rock Springs, Wyo., was built in 1862 by the Overland Stage Company. The station was attacked and burned at least once by Indians, and stagecoach passengers were supposedly robbed and murdered nearby by the notorious outlaw and onetime stage-line superintendent Jack Slade. Point of Rocks Stage Station has been a school, freight station, store, ranch headquarters and a home. It is one of the only stage stations remaining intact on the Overland Trail. This site is on the National Register of Historic Places.

Elwood Mead was only 30 in 1888 when Territorial Gov. Thomas Moonlight hired him to bring order to Wyoming’s water law. As territorial engineer Mead did just that, and his ideas were written into the state constitution adopted in 1890. Mead spent only 11 years in Wyoming, but all his life carried with him what he learned in the state.

Ruts carved two to six feet deep in a sandstone ridge on the south side of the North Platte River about a half mile south of Guernsey, Wyo., provide striking physical evidence of the route followed by hundreds of thousands of westbound emigrants the Oregon Trail during the years 1841-1869.

Sheridan, Wyoming first boomed when the Burlington and Missouri Railroad reached it in 1892. Named for a Civil War general and situated in the center of Indian War country, the town became a regional center for business and western culture. Sheridan developed many local processing industries in its first few decades, and also attracted wealthy residents. However, its fortunes have fluctuated with the nation’s demand for nearby natural resources like coal, and the changing economics of agriculture. Today, Sheridan’s unique identity is still rooted in its distinctive culture and scenic location near the Bighorn Mountains.

The history of Sheridan County, Wyo., located at the base of the Bighorn Mountains, includes polo ponies, working ranches and farms, a prestigious sanctuary for artists and writers and an abundance of American Indian lore, outlaws, pioneers, miners and Old West dude ranches. Railroads, and the coal mines dug for fuel to run the locomotives running also played important roles in the area’s development.

In 1850, the U.S. Congress authorized a conference to persuade Plains Indian tribes to live and hunt within newly designated, separate territories, and to accept payment for the damage caused by emigrants crossing their lands. The conference in September 1851 drew 10,000 Indians to the confluence of Horse Creek and the North Platte River, 30 miles east of Fort Laramie. The treaty that was signed there, the Horse Creek Treaty of 1851, permanently changed the terms of Indian-white relations on the northern Great Plains.