The Caddo Nation is a confederacy of several Southeastern

Southeastern tribes

Southeastern Woodlands peoples or Southeastern cultures are an ethnographic classification for Indigenous peoples that have traditionally inhabited the Southeastern United States and the northeastern border of Mexico, that share common cultural traits....

 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...

 tribes, who traditionally inhabited much of what is now East Texas

East Texas

East Texas is a distinct geographic and ecological area in the U.S. state of Texas.According to the Handbook of Texas, the East Texas area "may be separated from the rest of Texas roughly by a line extending from the Red River in north central Lamar County southwestward to east central Limestone...

, northern Louisiana

Louisiana

Louisiana is a state located in the southern region of the United States of America. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties...

 and portions of southern Arkansas

Arkansas

Arkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...

 and 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...

. Today the Caddo Nation of Oklahoma is a cohesive tribe with its capital at Binger, Oklahoma

Binger, Oklahoma

Binger is a town in Caddo County, Oklahoma, United States. The population was 708 at the 2000 census.Binger is the headquarters of the Caddo Nation of Oklahoma, who were settled here in the 1870s....

. The different Caddo languages have converged into a single language.
The Caddo Nation is a federally recognized tribe. They were previously known as the Caddo Tribe of Oklahoma.