Gabriela Hernandez and her two boys joined the "migrant caravan" of travelers across Mexico toward the United States, some hoping to cross the border. This is her story of the journey, compiled from multiple visits and interviews. She is late. Gabriela Hernandez has missed the caravan marching north. As she realizes her mistake, she also knows she can't let it go. She scrounges up enough coins to pay for a taxi. Not knowing exactly where the group is, they simply head north, asking along the way in the hope they will catch up with the group. The pregnant mother of...