A wall won't work for the simple reason that most contraband gets through at the border checkpoints
themselves, stupid. People and drugs hide inside cars. People tunnel under the existing walls.
Corruption allows migrants in. Companies want these workers. People want untaxed casual labor daycare and gardeners.
People want low wage menial workers to pick fruit and clean hotel sheets.

A stupid expensive wall takes care of none of the problem, if it is even a problem.

Your racism has blinded you stupid. Snap out of it, stupid.