MEXICO CITY — The Mexican army killed the leader of the Jalisco New Generation Cartel, Nemesio Rubén Oseguera Cervantes, "El Mencho, " on Sunday, decapitating what had become Mexico's most powerful cartel and giving the government its biggest prize yet to show the Trump administration its efforts. Oseguera Cervantes was wounded in an operation to capture him Sunday in Tapalpa, Jalisco about a two-hour drive southwest of Guadalajara and he died while being flown to Mexico City, the Defense