Immediately send all the criminals and anti-Americans back. Then create deportation centers in every city. Mandate illegals to register there. New illegals will be deported. Others here for so many years stay.
Threaten nations of origin with tariffs, cutting foreign aid,, etc, to make them create sanctuary cities within their country. They and the Democrats pay for them. Allow certain American factories there to provide jobs, but only a select few. Encourage small to medium size businesses owned locally. ASAP create the infrastructure.
Then fly or bus the illegal back to that new sanctuary city in their country. If the illegal does not comply or register, arrest and deport them to their nation but not to the new city. This would require master planning at the highest levels, but if little old me can envision this, then certainly PhD’s in economics and immigration, onboard with a Trump/MAGA plan like this can figure it out.
With Vance etc, later over time elevate the conditions in Latin America, in conformity with what you and I believe, about Catholic teaching on government and the economy. There is hope, with, thanks be to God, the re-election of Trump.