The four Southwestern state of the US that are all on the border of Mexico are Texas, California, New Mexico and Arizona. From West to East they would be; California, Arizona, New Mexico and Texas.
It shares a common border with the Southwestern states of Texas, New Mexico, Arizona and California.
Depending on how you define Southwestern states, you have Arizona and New Mexico for certain. California and Texas can be added to your list if your definition is broad enough. All of these states border Mexico. None of the states on the Canadian border would be considered "southwetern".
Both share a common border, both are in the Southwestern United States; both border the country of Mexico and both used to belong to Mexico before the Mexican-American War (1846-1848).
Arizona ("AZ") lies in the southwestern United States, on the border with Mexico.
Last time it was modified was during the Gadsden Purchase, in 1853.
Mexico borders the Southwestern states of Arizona, New Mexico and Texas.
Rattlesnakes are most common in the southwestern United States and Mexico.
Arizona lies in the southwestern United States, on the border with Mexico. The state is bordered by Utah to the north, by New Mexico to the east, to the south by the states of Sonora and Baja California (Mexico), and to the west by California and Nevada.
The state of New Mexico is located in the southwestern United States, along the U.S.-Mexico border. Mexico (the country) on the other hand, is along the southern boundary of the United States, bordering California, Arizona, New Mexico and Texas.
Mexico is directly south of and adjacent to the southwestern United States.
The states that border Mexico are California, Arizona, New Mexico and Texas...
Mexico borders the southwestern states California, Arizona and New Mexico. Mexico also borders Texas.