Quadripoint
The Four Corners Monument is the only point in the United States where four states meet: Colorado, Utah, New Mexico, and Arizona meet at right angles. The United States first acquired the area now called Four Corners from Mexico after the Mexican–American War in 1848. In 1863 Congress created Arizona Territory from the western part of New Mexico Territory. The boundary was defined as a line running due south from the southwest corner of Colorado Territory, which had been created in 1861. By defining one boundary as starting at the corner of another Congress ensured the eventual creation of four states meeting at a point, regardless of the inevitable errors of boundary surveying. The monument is centered at .
Trail of the Ancients
The National Scenic Byway crosses the Colorado Plateau of the Four Corners region along prehistoric sites of Native Americans, including the Navajo, Utes and early puebloan people, who lived and farmed in the area from about 1 CE to about 1300 CE. There were people hunting and gathering for food in the Four Corners region by 10,000 B.C. or earlier. Geological features include sandstone-rimmed canyons, snow-capped mountains, red rock landscapes and green valleys. Most of the stops — archaeological sites, Native American lands or modern communities — are near or on paved roads, but some of the roads are rugged graded roads.