Register Cliff, near present Guernsey, Wyo., is one of three large “registers of the desert” in Wyoming where Oregon-, California- and Utah-bound emigrants carved their names on rock. Many of the inscriptions are from the peak years of Oregon Trail travel in the 1840s and 1850s. The area close to Register Cliff was the first night’s camp west of Fort Laramie. Today, this site is a National Historic Site.

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.

Before Glendo Dam could be built on the North Platte River in Platte County, Wyoming, complicated water-rights disputes had to be settled among Wyoming, Nebraska and Colorado and the settlement approved by the U.S. Supreme Court. The process took more than a decade, and shows the difficulties of allocating water in the arid West. The earthfill dam, nearly 2,100 feet long and 190 feet high, was completed in the fall of 1957. It stores water for irrigation and recreation, controls floods, reduces sedimentation in the Guernsey reservoir downstream and produces hydropower.

The construction of the Union Pacific in 1868 gave rise to the towns, geography of settlement and the economy of new Wyoming Territory in 1869. Obstacles to construction were both physical and financial, and the railroad overcame them with sometimes slapdash results—hastily laid track and rickety bridges, watered stock and Congressional corruption. But the Union Pacific contributed enormously to Wyoming’s growth and development, made its modern economy possible and continues today as an economic power in the state.

The vivid, charismatic J. B. Okie raised sheep near Badwater Creek at the turn of the last century, and was so successful he was called “Sheep King.” A businessman with great vision, he soon owned half a dozen stores in small towns in central Wyoming, and eventually an equal number in Mexico. Lost Cabin, Wyo., named for the legendary Lost Cabin Mine, was his base. Okie built an opulent mansion there, a big bunkhouse for employees, bungalows for guests, an office building, a roller rink, a golf course and an aviary full of birds of paradise (left), cockatoos and macaws.

After World War II, the University of Wyoming was bursting with returning veterans just as the nation, nervous about Communist expansion worldwide, was sliding into the Cold War. UW trustees called for the investigation of textbooks in use on campus to determine if they were “subversive or un-American.” The faculty overwhelmingly resisted the move, and both sides reached a compromise guaranteeing academic freedom in the future.

Jack Gage was serving as Secretary of State when Governor Hickey resigned to enter the U.S. Senate. Gage became acting Governor January 2, 1961 and served for the duration of Hickey's term.

The JC Penney Company, long among the world’s largest department store chains, traces its roots to a one-room shop in a small Wyoming coal-mining town at the turn of the last century. Penney’s career in Wyoming lasted just a decade, but in 1902, Wyoming provided exactly what young Penney needed to found a chain that has survived, as of 2011, for 109 years.

Although the Teapot Dome Scandal of the 1920s was named for a Wyoming rock formation resembling a teapot, the wrongdoers were not from the state. During the administration of President Warren G. Harding, oilmen Harry Sinclair and Edward Doheny bribed Secretary of the Interior Albert Fall to gain access to the naval petroleum reserves located at Teapot Dome in the Salt Creek field north of Casper in northern Natrona County. Fall was the first Cabinet official to be imprisoned for crimes committed during his time in office. Sinclair also served a jail sentence.

On April 2, 1909, seven cowmen attacked a sheep camp near Spring Creek in the southern Big Horn Basin. The raiders killed three men, kidnapped two others, killed sheep dogs and dozens of sheep and destroyed thousands of dollars of personal property. It was the deadliest sheep raid in Wyoming history. Unlike many previous incidents after which raiders went unpunished, however, prosecutors this time were successful and five raiders were jailed, marking the end of 15 years or more of violence between cattle- and sheepmen.