The basin of the North Platte River takes up the southeastern quarter of Wyoming, plus a finger of land along the tributary Sweetwater River in the center of the state. The courses of the North Platte and Sweetwater determined early fur-trade and emigrant routes. Since that time, the basin’s water and other resources have continued to draw industry, stock raising, dams and irrigation—and people.

Medicine Lodge State Archaeological Site, northeast of Hyattville, contains pictographs and petroglyphs left by Wyoming’s ancient people, as well as an attractive, state-run campsite and small museum. Archaeologists have found evidence at the site of human habitation stretching back 10,000 years.

From their modest upbringings, Mardy and Olaus Murie became diligent, adventurous and charismatic leaders of the American conservation movement. With their siblings, Louise and Adolph Murie, they shaped conservation biology and ecology and are credited with some of our country’s most historic efforts to protect wild lands. The two couples split their time between remote Alaska and a ranch at the feet of the Tetons, where the Murie Center carries on their efforts today.

University of Wyoming student Matthew Shepard, who was openly gay, was brutally beaten in October 1998 by Aaron McKinney and Russell Henderson. Shepard died several days later. The incident received international media coverage and continues to spark controversy about hate crimes. Shepard’s parents, Judy and Dennis, established a foundation in Matthew’s name, which continues its pro-LGBT educational work today.

Chinese contract laborers were among the first residents of Evanston, Wyo., which was created as a service stop for locomotives between Green River, Wyo., and Ogden, Utah, on the Union Pacific Railroad’s transcontinental route. Later, travelers drove through town on the Lincoln Highway. The Wyoming State Hospital, known as the Wyoming Insane Asylum in territorial days, is located here. Like many of the state’s towns, Evanston’s rich oil resources contribute to its continuing “boom and bust” cycles, and tourism plays a prominent role in the town’s economy.

Mike Sullivan practiced law with the firm of Brown, Drew, Apostolos, Massey, and Sullivan for twenty years and then ran for Governor in 1986. Governor Sullivan won the election and took office on January 7, 1987.

Accidents and disasters have plagued Wyoming coal mines since territorial times. In 1886, legislators created the office of the state mine inspector to help improve safety. Still, explosions and cave-ins killed hundreds of miners in the following decades. The worst accidents happened in Hanna in 1903 and near Kemmerer in 1923. Lawmakers continued to increase safety measures and eventually expanded the duties of the state mine inspector. Modern strip mining is far safer.

Milward Simpson also served on the University of Wyoming Board of Trustees from 1939 until 1954 when he was elected Governor.

The Mineral Leasing Act of 1920 established the modern system by which oil and coal companies may lease federal land. This system has proven enormously beneficial to Wyoming’s state coffers since it was first enacted nearly 100 years ago. How this all came about is a story of early oil producers looking for a way around a presidential order and a highly contentious Supreme Court case, all with lucrative results for the state of Wyoming—and a stabilizing result for the industry.

In 1992, officials from The Church of Jesus Christ of Latter-day Saints placed monuments commemorating the ill-fated, 1856 journey of the Willie and Martin handcart companies at Martin’s Cove, on public land leased for livestock grazing by the Sun Ranch near Devil’s Gate in central Wyoming. In 1997, the LDS church bought the ranch, and in subsequent years tried to get a bill through Congress to allow church purchase of the cove as well. The bill was opposed by some Wyoming citizens, however, and by Wyoming’s U.S. senator, Craig Thomas. Instead, a compromise 25-year lease was negotiated between the church and the Bureau of Land Management, guaranteeing public access to the public.