The Mexican border security wall should serve some synergetic goals such as energy and water making for the American S.W. and perhaps Mexico instead of being a dead, metal screen. Metal fencing is easy for politicians and contractors to think about and provide paychecks to a few, yet it isn't the more bang for the buck approach to governing.
It might be possible to sell space to erect a solar panel coated barrier to corporations that could share in the profit from selling electricity to utilities. A vast solar panel could also power electric cars that would drive patrols along the berm and maybe canal for desalinating saltwater through evaporation and condensation. Saltwater would be pumped from the Pacific Ocean to Deming New Mexico to fill the canal with locks that would actually be used for recreation with lagoons in some areas too.
It might be possible to sell space to erect a solar panel coated barrier to corporations that could share in the profit from selling electricity to utilities. A vast solar panel could also power electric cars that would drive patrols along the berm and maybe canal for desalinating saltwater through evaporation and condensation. Saltwater would be pumped from the Pacific Ocean to Deming New Mexico to fill the canal with locks that would actually be used for recreation with lagoons in some areas too.