Net migration between the US and Mexico is small. Pew research numbers:

An estimated 870,000 Mexican migrants came to the U.S. between 2013 and 2018, while an estimated 710,000 left the U.S. for Mexico during that period. That translates to net migration of about 160,000 people from Mexico to the U.S., according to government data from both countries.

That's 160,000 net in-migration from Mexico over 5 years. How much would you spend to bring that to zero?

You might think a bunch of tech people would profile performance before deciding what to optimize.