New Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. New Mexico is the 5th most extensive, the 36th most populous, and the 6th least densely populated of the 50 United States. Inhabited by Native American populations for many centuries, New Mexico has also been part of the Imperial Spanish viceroyalty of New Spain, part of Mexico, and a U.S. territory. Among U.S. states, New Mexico has the highest percentage of Hispanics, including descendants of Spanish colonists and recent immigrants from Latin America. It also has the second-highest percentage of Native Americans, after Alaska, and the fifth-highest total number of Native Americans after California, Oklahoma, Arizona, and Texas. The tribes in the state consist of mostly Navajo and Pueblo peoples. As a result, the demographics and culture of the state are unique for their strong Hispanic and Native American influences. The flag of New Mexico is represented by the red and gold colors, which represent Spain, as well as the Zia symbol, an ancient Native American symbol for the sun.