File:Arizona+Land+1852.jpg

Summary
9 Jan 1852 - New Mexico redefined the boundaries of previous counties and created new ones to cover all the land within its territory. The boundary of Dona Ana County was expanded to include some land in present day Arizona, while the boundary of Socorro County was stretched across present day Arizona to the California border. The boundaries of Bernalillo, Rio Arriba, Santa Ana (extinct), Taos, and Valencia counties were stretched across present day Arizona and Nevada to the California border