LAREDO, Texas (AP) — Nearly three dozen migrants marched across the U.S.-Mexico border without papers Monday, the latest group of a younger generation brought to the U.S. illegally as children that seeks to confront head-on immigration policies they consider unjust.Wearing a colorful array of graduation-style caps and gowns, 34 young people who spent long stretches of their childhoods in U.S. cities like Phoenix and Boston chanted “undocumented and unafraid” as they crossed the Rio Grande into Texas. Customs officials separated them from regular pedestrian traffic and the rest of their entourage before beginning lengthy interviews.The risks born by their parents’ generation involved dangerous journeys through darkness across desert and river. The teenagers and 20-somethings who crossed Monday face what could be weeks in detention and possible deportation as part of what could be a growing form of public protest.They follow the “Dream Nine,” a smaller group that attempted to enter the U.S. at Nogales, Arizona, in July.