The Chickasaw Nation is a federally recognized Native American

Native Americans in the United States

Native Americans in the United States are the indigenous peoples in North America within the boundaries of the present-day continental United States, parts of Alaska, and the island state of Hawaii. They are composed of numerous, distinct tribes, states, and ethnic groups, many of which survive as...

 nation, located in Oklahoma

Oklahoma

Oklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...

. They are one of the members of the Five Civilized Tribes

Five Civilized Tribes

The Five Civilized Tribes were the five Native American nations—the Cherokee, Chickasaw, Choctaw, Creek, and Seminole—that were considered civilized by Anglo-European settlers during the colonial and early federal period because they adopted many of the colonists' customs and had generally good...

. The Five Civilized Tribes were differentiated from other Indian reservations in that they had semi-autonomous constitutional governments and delegates in the U.S. House of Representatives. The Chickasaw Nation was created after the Chickasaw

Chickasaw

The Chickasaw are Native American people originally from the region that would become the Southeastern United States...

 were removed to Indian Territory

Indian Territory

The Indian Territory, also known as the Indian Territories and the Indian Country, was land set aside within the United States for the settlement of American Indians...

 in the 1830s.
The Chickasaw Nation is headquartered in Ada, Oklahoma

Ada, Oklahoma

Ada is a city in and the county seat of Pontotoc County, Oklahoma, United States. The population was 16,008 at the 2000 census. As of 2009, the city population was estimated at 17,019....

.