There has been an established border crossing system for years. Placing a wall with turrets, cameras, alligators, barbed wire, and drones demonstrates fear of people that don't have even 75% of the offensive capabilities that you do. What are you so scared of?
We have tried, in many countries, but unfortunately the U.S. continues to meddle in our business, so the solution that some see is for us to step up our meddling in your business and change your way of life for the sake of our survival. It's a logical outcome, a boomerang effect, that you guys have bred and now you will reap what you have sowed for 200 years.