Extending nearly 2,000 miles from southern Texas to a fence jutting out into the Pacific Ocean in San Diego, America’s border with Mexico is as long and as varied as the terrain. Remote spots in the desert like Columbus, a town of 1,600 people about 80 miles west of El Paso, are sleepily tranquil. In cities like El Paso and San Diego, the growing number of migrant families pushing for entry to the United States has generated crowds and controversy, with migrants packed into detention centers and bus stations, and clashes at the fences between rock-throwing immigrants and federal agents.

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