For starters, let’s look at how much “foreign aid” money the US is sending to Mexico, Guatemala, etc. That stops on Day #1. Then we can look at tarrifs, duties, and other economic sanctions. Before long they will be crying “el tio”.
I encourage putting ‘Trump’ bumper stickers up in their communities - they should not feel at ease
Americas, Mexico 2013 = $417.8 million 2014 = $971.3 million.
https://en.wikipedia.org/wiki/List_of_countries_by_foreign_aid_received