Gary Paul Nabhan: The wall with Mexico will come tumbling down

Few walls last forever. Last winter, part of President Trump’s new border wall wavered toward collapse under the force of strong winds whipping through the twin cities of Calexico and Mexicali. An 80-foot segment lurched into Mexican territory, and it took cranes from the U.S. side to right the steel panels.Most of the families I know that live close to the border have arrived at the same conclusion: The monstrous wall so close to them has further militarized our international boundary wit