Answer:
California, Arizona, New Mexico, and Texas.
Step-by-step explanation:
Those align against Mexico which a national river border separates both countries.
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.
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