Kansas is a Midwestern state in the Central United States. It is named after the Kansas River which flows through it, from the French "Cansez", by explorer Étienne de Veniard, Sieur de Bourgmont, and after the Kansa tribe, who inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south wind", although this was probably not the term's original meaning. Residents of Kansas are called "Kansans."

The area was historically home to large numbers of nomadic Native Americans that hunted bison. It was first settled by white Americans in the 1850s, in the midst of political wars over the slavery issue. When officially opened to settlement by the U.S. government in 1854, abolitionists from New England and pro-slavery settlers from neighboring Missouri rushed to the territory to determine if Kansas would become a free state or a slave state. Thus, the area was a hotbed of violence and chaos in its early days as these forces collided, and was known as Bleeding Kansas. The abolitionists eventually prevailed and on January 29, 1861, Kansas entered the Union as a free state. After the Civil War, the population of Kansas exploded when waves of immigrants turned the prairie into productive farmland. Today, Kansas is one of the most productive agricultural states, producing many crops, and leading the nation in wheat and sunflower production.

For millennia, the land that is presently Kansas was inhabited by Native Americans. The first European to set foot in present-day Kansas was Francisco Vásquez de Coronado, who explored the area in 1541. In 1803, most of modern Kansas was secured by the United States as part of the Louisiana Purchase. Southwest Kansas, however, was still a part of Spain, Mexico, and the Republic of Texas until the conclusion of the Mexican-American War in 1848. From 1812 to 1821, Kansas was part of the Missouri Territory. The Santa Fe Trail traversed Kansas from 1821 to 1880, transporting manufactured goods from Missouri and silver and furs from Santa Fe, New Mexico. Wagon ruts from the trail are still visible in the prairie today.

In 1827, Fort Leavenworth became the first permanent settlement of white Americans in the future state and this migration stream originated in the upland South. The Kansas-Nebraska Act became law on May 30, 1854, establishing the U.S. territories of Nebraska and Kansas. Kansas Territory stretched all the way to the Continental Divide and included the sites of present-day Denver, Colorado Springs, and Pueblo.

Missouri and Arkansas sent settlers into Southeastern Kansas, namely Crawford County, Bourbon County, and Cherokee County, who attempted to sway votes in favor of slavery. The secondary settlement of Americans in Kansas Territory were abolitionists from Massachusetts and other Free-Staters, who attempted to stop the spread of slavery from neighboring Missouri. Directly presaging the American Civil War, these forces collided, entering into skirmishes that earned the territory the name of Bleeding Kansas. Kansas was admitted to the United States as a free state on January 29, 1861, making it the 34th state to enter the Union. By that time the violence in Kansas had largely subsided. However, during the Civil War, on August 21, 1863, William Quantrill led several hundred men on a raid into Lawrence, destroying much of the city and killing nearly two hundred people. Until the 1995 bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma. Quantrill's raid was the single bloodiest act of domestic terrorism in America.

After the Civil War, many veterans constructed homesteads in Kansas. Many African Americans also looked to Kansas as the land of "John Brown" and led by men like Benjamin "Pap" Singleton began establishing black colonies in the state. At the same time, the Chisholm Trail was opened and the Wild West era commenced in Kansas. Wild Bill Hickok was a deputy marshal at Fort Riley and a marshal at Hays and Abilene. Dodge City was another wild cowboy town in the late 19th century. In one year alone, 8 million head of cattle from Texas boarded trains in Dodge City bound for the East, earning Dodge the nickname "Queen of the Cowtowns." Bat Masterson and Wyatt Earp were both lawmen in Dodge City. In part as a response to the violence perpetrated by cowboys, on February 19, 1881, Kansas became the first U.S. state to adopt a Constitutional amendment prohibiting all alcoholic beverages.