The Hopi are a Native American tribe who primarily live on the Hopi Reservation in northeastern Arizona. The primary meaning of the word "Hopi" is translated as "behaving one, one who is mannered, civilized, peaceable, polite, who adheres to the Hopi Way." There are roughly 20 thousand modern day Hopi in the United States. The Hopi Tribe is a sovereign nation within the United States and has government-to-government relations with the United States Federal government. Particular villages retain autonomy under the Hopi Constitution and Bylaws. The Hopi language is one of 30 in the Uto-Aztecan language family. The majority of Hopi people are enrolled in the Hopi Tribe of Arizona but some are enrolled in the Colorado River Indian Tribes. The Hopi Reservation in Arizona covers a land area of 2,532 square miles that is surrounded by the Navajo Nation. The Hopi encountered Spaniards in the 16th century, and are historically referred to as Pueblo people, because they lived in villages (pueblos in the Spanish language). The Hopi are descended from the Ancestral Puebloans (Hopi: Hisatsinom), who constructed large apartment-house complexes and had an advanced culture that spanned the present-day Four Corners region of the United States, comprising southeastern Utah, northeastern Arizona, northwestern New Mexico, and southwestern Colorado. They lived along the Mogollon Rim, especially from the 12th–14th century, after which time their cultures seemed to have disappeared.