sheer numbers of them is a big one, and their geographic distribution across the interior. It’s just a sticky problem, and there is no simple, one word answer to a problem that we spent 20 years getting ourselves into.
secure the border. enforce the immigration laws on the books. it may take 10 years, but you would have significantly solved the problem.
There are more citizens as well. What has decreased is will.
* Deport illegal aliens on contact with LE
* Enforce the law on employers of illegal aliens
* Build the border fence required by law
* Eliminate entitlements for illegal aliens