Yes, we should invade Mexico and occupy a buffer zone. A smaller zone of say 5 or 10 miles would take less forces to occupy. To live within or enter the zone, one must have a US passport or a foreign passport with a visa.
Then the troops it would take to occupy 50 miles in depth can be used to occupy Hondouras. The houndouran government would be abolished and replaced with a militry governor.
Both occupations would continue until the trafficing of illegals is stopped.
The governor of Californis should be put on notice that his job is as tenuous as that of the president of Hondouras.
Do you know how many millions of Mexicans live in border towns like Nuevo Laredo and Cuidad Acuna? Do you know there are 1,954 miles of US/Mexico border?
For these 2 reason alones, a Buffer Zone would never work.