La Paz was a short-lived, early gold mining town along the Colorado River in La Paz County on the western border of the U.S. state of Arizona. It was the location of the La Paz Incident in 1863, the westernmost confrontation of the American Civil War. The town was settled in 1862 in New Mexico Territory, before the Arizona Territory was officially declared a United States territory by President Abraham Lincoln. Today it is a deserted ghost town.