Gerston Miranda and his wife were among thousands of migrants recently arriving at this remote area on Arizona's southern border with Mexico, squeezing into the United States through a gap in the wall and walking overnight about 14 miles (23 kilometers) with two school-aged daughters to surrender to Border Patrol agents.
"There is no security in my country," said the 28-year-old from Ecuador, who lost work when his employer closed due to extortion by criminals. "Without security you cannot work. You cannot live."
A shift in smuggling routes has brought an influx of migrants here from countries as diverse as Senegal, Bangladesh and China, prompting the Border Patrol to seek help from other federal agencies and drawing scrutiny to an issue critical in next year's presidential elections.
