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Immigration And Border Security Issues Loom Heavy In U.S. Elections

John Moore/Getty Images

The U.S.-Mexico border fence snakes over sand dunes on September 28, 2016 in the Imperial Sand Dunes recreation center in California. Without daily removal of sand, which drifts against the fence, the dunes would cover the fence and undocumented immigrants and smugglers could simply walk over it. The border stretches almost 2,000 miles between Mexico and the U.S.

2016 in numbers