White settlement in Sublette County, Wyo. traces its roots to the late 1870s, when cattlemen brought herds to the pastures where North, Middle and Piney Creeks join the Green River. The town of Big Piney was incorporated there in 1913. The next year, neighboring Marbleton was incorporated a mile away, on higher ground on the bench above Piney Creek. Every effort to combine the two towns has failed, and they continue to maintain separate governments though they share most other services. The energy industry is now the major employer in both communities. Big Piney registered a population of 552 in the 2010 census, and Marbleton, 1,094.

The Powder River Basin sports a colorful history. Bones of bison slaughtered by people, found south of Sundance, Wyo., date back 6,000 years, and northeast Wyoming remained a favorite hunting ground for American Indians into the late 19th century. At that time the Powder River Basin was the scene of violent conflicts between the Indians and U.S. military men. Abundant grass made this region a favored spot for cattle and sheep ranchers. Under the grass is coal—so much of it that about 40 percent of the coal mined in the U.S., comes from the Powder River Basin.

Converse County, Wyo., lists Triceratops discoveries and the annual Wyoming State Fair among its claims to fame. As happened with many of the state’s counties, the economic commerce created by the arrival of the railroad brought more people and more possibilities to the area.

In 1871, Amalia Post of Cheyenne, Wyoming Territory, became one of the first women to serve on a jury in the United States. Soon, she began advocating for women’s rights on a national level. She was an independent businesswoman from the time her first husband abandoned her in Denver in the early 1860s, through her marriage to her second husband, Cheyenne banker and politician Morton Post and up to the time of her death in 1897.

The Ames Monument, a 60-foot-high granite pyramid, was completed in 1882 at the highest point on the Union Pacific Railroad, to honor railroad financiers Oakes and Oliver Ames. The tracks have since been moved, but the monument is still easily visible and accessible from Interstate 80 between Cheyenne and Laramie, Wyo.

German-American landscape artist Albert Bierstadt captured a transformative time in American history. His travels through Wyoming and the West gave Bierstadt a one-of-a-kind perspective for painting his best-known works in the 1850s and 1860s, and his grandiose landscapes and their idealized, pristine panoramas have sparked the imagination of generations.

Created in 1868 before Wyoming was even a territory, Albany County and its vast plains are still good for livestock grazing. Thanks to the Union Pacific Railroad and early gold and copper mining, however, the county was industrial in its earliest times. Laramie, the county seat, was chosen as the site of the University of Wyoming in 1886, and the university stabilizes the town’s economic and cultural life.

The Casper Army Air Base was built quickly in 1942 to train bomber crews for World War II combat. The facility trained more than 16,000 men before the end of the war. Its population grew to a third of the size of Casper’s, bringing prosperity and a lively social life to the town. The base closed in 1945, when the war ended.

The railroad hailed once as the “only line to the great Wyoming copper mining district” in the upper North Platte Valley failed to arrive in time for the copper boom—but still carried passengers and cattle for decades, and lumber for nearly a century.

After joining the Republican Party, Amos W. Barber was elected Secretary of State in September 1890 and served until January of 1895. Secretary Barber's term was interrupted while he served as Acting Governor from November 24, 1890 until January 2, 1893.