At age 31, Nixon Arias cut a profile similar to many unauthorized immigrants in the United States. A native of Honduras, he had been in the country for more than a decade and had worked off and on for a landscaping company for nine years. The money he earned went to building a future for his family in Pensacola, Fla. His Facebook page was filled with photos of fishing and other moments with his three boys, ages 3, 7 and 8. But in November 2013, that life began to unravel. The previous year, Arias had been mowing the median of Highway 59 just over the Alabama line when his riding lawnmower hit a hole, throwing him into the air.