More than a decade after he first got deported, Marco was staring into the United States from a bank of the Rio Grande. Across the turgid river he could see a tangle of mesquite and huisache trees in the town of Eagle Pass. U.S. Border Patrol agents milled about, but Marco felt undaunted. “I know it wasn’t the legal way,” he told me recently, “but I was about to fulfill my dream of getting to be in this great country.”Marco (a pseudonym) had spent a year traveling north from his home, in Honduras, stopping to work construction jobs along the way to save money for bus tickets. Worried about getting kidnapped and held for ransom, or killed, by cartel members, he had plotted how to…