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.
Mexico–United States barrier In September 2017, the U.S. government announced the start of construction of eight prototype barriers made from concrete and other materials.[51][52] On June 3, 2018 the San Diego section of the US border wall construction began. [53]