Four Corners Monument
The Four Corners Monument marks the quadripoint in the Southwestern United States where the states of Arizona, Colorado, New Mexico, and Utah meet. It is the only point in the United States shared by four states, leading to the area being named the Four Corners region. The monument also marks the boundary between two semi-autonomous Native American governments, the Navajo Nation, which maintains the monument as a tourist attraction, and the Ute Mountain Ute Tribe Reservation.
Commonwealth (U.S. state)
Commonwealth is a designation used by four of the 50 states of the United States in their full official state names: Kentucky, Massachusetts, Pennsylvania, and Virginia. Commonwealth is a traditional English term for a political community founded for the common good. Prior to the formation of the United States of America in 1776, all four were part of Great Britain's possessions along the Atlantic coast of North America. As such, they share a strong influence of English common law in some of their laws and institutions.