parts of these states made up the mexican border district
Mexico–United States border The U.S. states along the border, from west to east, are California, Arizona, New Mexico, and Texas. The Mexican states along the border are Baja California, Sonora, Chihuahua, Coahuila, Nuevo León, and Tamaulipas.
New Mexico At total area 121,699 square miles (315,200 km2),[17] the state is the fifth-largest state of the US, and slightly larger than British Isles. New Mexico's eastern border lies along 103° W longitude with the state of Oklahoma, and (due to a 19th-century surveying error[18]) 2.2 miles (3.5 km) west of 103° W longitude with Texas.[19] On the southern border, Texas makes up the eastern two-thirds, while the Mexican states of Chihuahua and Sonora make up the western third, with Chihuahua making up about 90% of that. The western border with Arizona runs along the 109° 03' W longitude.[17] The southwestern corner of the state is known as the Bootheel. The 37° N latitude parallel forms the northern boundary with Colorado. The states of New Mexico, Colorado, Arizona, and Utah come together at the Four Corners in New Mexico's northwestern corner. New Mexico, although a large state, has very little water. Its surface water area is about 250 square miles (650 km2).