PRESIDENT DONALD TRUMP VISITS THE BORDER WALL WITH MEXICO DURING THE LAST DAYS OF HIS PRESIDENCY. The Mexico–United States barrier, also known as the border wall, is a series of vertical barriers along the Mexico–United States border intended to reduce illegal immigration to the United States from Mexico. The barrier is not a continuous structure but a series of obstructions variously classified as "fences" or "walls". Between the physical barriers, security is provided by a "virtual fence" of sensors, cameras, and other surveillance equipment.
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