Two of the most important cities in North America are so physically close they would touch were they not separated by a wall at the US-Mexico border. That border has been a flashpoint of contention for centuries. And yet, the untold reality in San Diego and Tijuana is that tens of thousands of people cross through that wall in both directions--lawfully--each day, to work, go to school, socialize, and visit "the other side of town." While fights...
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