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 .
Candia Four Corners, New Hampshire
The name "Four Corners" refers to three roads which intersect at the village center: High Street, Main Street, and Deerfield Road. High Street, running east-west, is a portion of New Hampshire Route 27, which stretches from Hooksett (to the west) to Hampton Beach, New Hampshire (to the east). This road was formerly the main east-west thoroughfare through southern New Hampshire, but was replaced by New Hampshire Route 101, a four-lane expressway to the south of the Four Corners. Main Street, departing to the south, and Deerfield Road, going north, make up a portion of New Hampshire Route 43, which originates in Candia at NH 101.