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It's estimated that more than 1 million undocumented immigrants cross the U.S./Mexico border each year. With a growing tide of illegal activity that includes human and drug smuggling, the U.S. government has tightened its grip on the 2,000-mile border. But by foot or by car, immigrants and their traffickers risk their lives to reach the United States. NGC goes to the border to examine this polarizing topic, following as Mexican drug smugglers and job seekers attempt to cross the border.