Interesting history during prohibition when El Paso issued its own identity cards at a time tensions were rising between US and Mexico about fees for crossing the border. Not directly wall related but points out economic interdependence from 100 years ago.

Border fee dispute with Mexico led El Paso to issue ID cards in 1921

Mexico's ban on short-term passports appeared to be in retaliation for a $10 visa fee the U.S. Consul was charging Mexicans to travel into the U.S.

El Paso Times