More than 30 Million people crossed the San Ysidro border of Tijuana in 2017, just where the wall raises from the sea to start the long sneaky journey across the US- Mexico border. The wall has become a character by itself for both sides of the territory and is the source of both Mexican jokes and international frustration. What once was a simple 3 foot tall fence is about to become, according to Donald Trump, a symbol of the United States and a bang on the table for nationalists.

Together with the reinforcement of the physical barrier, a strategy of systematic criminalization of those who travel...