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b'The San Ysidro-Tijuana border crossing in California, for instance, is the world\\u2019s busiest: It\\u2019s an entry point to a binational region with a gross annual product of more than $220 billion, according to data from UC San Diego\\u2019s Center for U.S.-Mexican Studies. Every day, it is traversed by approximately 63,000 pedestrians, 120,000 passenger vehicles and 6,000 trucks.Fonna Forman of UC San Diego\\u2019s Cross-Border Initiative, told me. \\u201cWe have always believed that the wall, and the border region more generally, is a site of cultural, artistic and architectural experimentation. And in this sense, it is a laboratory for border region development across the globe.\\u201d\\u201cThere is obviously a lot of fear and uncertainty in the border communities in which we work,\\u201d Forman told me.Ruxandra Guidi\\n\\nDHS estimates that of the 45 million immigrants who entered the U.S. by air or by sea on tourist or business visas that expired in 2015, roughly 416,500 were still living in the country in 2016. That\\u2019s excluding those who entered via land boundaries\\u2014DHS did not release that data\\u2014so, the total number of visa overstays in 2016 is likely much higher. (By comparison, between2011 and 2016, at the southern border ranged from 328,000 to 479,000 per year.) Politico'