Although illegal migration numbers haven't changed much since 2005, the demographics of illegal immigrants have. It's important to ask why people are illegally migrating into the u.s. A more effective strategy would be to address those issues, especially because the u.s. greatly contributed to destabilizing South and Central America.

https://www.migrationpolicy.org/sites/default/files/Explainer-IllegalImmigration-PRINT-Final.pdf