on the southern border of Mexico. Split the cost. It's a much shorter border. It would shut down the Central American migrants for both countries. In return Mexico enhances security on their Northern border, enhance extradition and deportation laws, set up housing facilities on the Mexican side, and work on setting up a better worker visa program that allows taxing the workers.
https://www.foxnews.com/us/over-1000-hondurans-head-for-us-border-in-mass-migration-march-report
https://www.foxnews.com/us/over-1000-hondurans-head-for-us-border-in-mass-migration-march-report