The history of nuclear weapons in Wyoming is intimately connected to the F. E. Warren Air Force Base, which in turn is tied to the global development of rocketry and nuclear might. If Wyoming were a nation, Warren AFB in Cheyenne would make it one of the world’s major nuclear powers. Its history with nuclear weapons in Wyoming is tied closely to the worldwide tensions of the Cold War, and with the development of missile-based nuclear weapons systems.

Cantonment Reno, at the Powder River Crossing of the Bozeman Trail in present Johnson County, was renamed Fort McKinney after the death of Lt. J.A. McKinney in 1876. That site was abandoned in 1878, and the fort’s name moved with the troops to a new site west of present Buffalo, Wyo. The fort closed in 1894, and in 1903 the site was taken over by the Veterans’ Home of Wyoming, which remains in operation there today.

The U.S. Army established Platte Bridge Station in 1862 to protect the Oregon/California/Mormon Trail crossing of the North Platte River and the new transcontinental telegraph. After Lt. Caspar Collins was killed there by Cheyenne and Lakota Indians in 1865, the post was renamed Fort Casper, misspelling his first name. The fort was abandoned two years later, but reconstructed in 1936—and renamed Fort Caspar—with funds from the Works Progress Administration. Fort grounds and a museum are open to the public.

The abundant vertebrate fossils of the Green River formation in western Wyoming have been known to science since the 1860s. Most are fish, buried in lime-rich mud at the bottom of freshwater lakes about 50 million years ago. Fossil Butte National Monument, west of Kemmerer, Wyo. was created by Congress in 1973 to protect a site extremely rich in these fossils.

Home to 19 of Wyoming’s first families, the Historic Governor’s Mansion was occupied from 1904 through 1976, opened to the public in 1977 and extensively renovated in 2004.

The story of uranium in Wyoming is a high-stakes drama whose cast includes fever-driven prospectors, ranchers defending their property rights, government officials intent on national security, entrepreneurs, engineers and world-class mining companies.

In 1869, Fort Fred Steele was built by the U.S. Army to protect workers on the advancing transcontinental railroad at the spot where the rails crossed the North Platte River. The fort was closed in 1886, and the site, containing foundations of the original buildings, was much later acquired by the state.

Fort Laramie began as a fur-trade post in 1834 near the confluence of the Laramie and North Platte rivers. Soon it changed into a post for the trade in buffalo robes, and for supplying emigrants bound west on the Oregon/California/Mormon Trail. In 1849 the post was purchased by the U.S. Army, and became an important supply, logistics and communications center for the Indian Wars campaigns of the next four decades. In recent decades the post has been carefully restored, and today is a National Historic Site.

Guernsey Dam on the North Platte River lies between historic Fort Laramie and Laramie peak and just a few miles from some deep, sandstone ruts on the historic Oregon Trail. The dam was completed in 1927, for hydropower and flood control. In 1934, crews from the Civilian Conservation Corps located camps near the reservoir. With design help from the National Park Service, they built the handsome stone-and-timber shelters and buildings at Guernsey State Park, in what became a showplace of state park design.

Fort Fetterman was established by the U.S. Army on the North Platte River near present Douglas, Wyo. in 1867. It served as a staging point for Gen. George Crook’s three campaigns against Cheyenne and Lakota Sioux Indians in 1876, near the end of the Indian Wars. The Army abandoned the post in 1882, and the settlement finally closed down a few years later when the railroad arrived at Douglas, seven miles to the south.