There are countless ways to force Mexico to pay for the wall so make Mexico pay for the ****ing wall. Seize the assets of drug dealers to pay for the wall. Impose a tax on wire transfers to Mexico. Take the money from the obstinate sanctuary cities. Raise the fees for applying for Visas. Put in toll booths at the border. Fine the shit out of companies caught hiring illegals. put a tariff on Mexican imports. Make Mexico pay for the ****ing wall!
None of that is going to even be needed. A wall will stop a lot of activity which is currently harmful to both Mexico and the USA.
It’s a guaranteed great investment. The trouble that it will keep us from having from Mexico will pay for the wall. And as a bonus to Mexico, America will have to feed its dope habits some other way, and any remaining clandestine Mexican drug activity will now be for domestic (Mexico) consumption only.