The Navajo are the largest federally recognized tribe of the United States, with more then 300,000 members, and the Navajo Nation constitutes an independent governmental body, which manages the Navajo Indian reservation (in the Four Corners area), which extends into the states of Utah, Arizona and New Mexico. Diné Bikéyah, or Navajoland, one of the most arid and barren portions of the Great American Desert, is larger than 10 of the 50 states in America. Regarding the name, the Spaniards used the term Apachu de Nabajo for the first time in the 1620s to refer to the people in the Chama Valley region, and since 1640s began to use the term "Navajo" to refer to the Diné (meaning "The People"), as prefer they to call themselves. The Navajo are speakers of a Na-DenéSouthern Athabaskan languages known as Diné bizaad. The importance of their contribution, as code talkers, at the Japanese defeat in the Pacific in WWII is well known.
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