The Mexican army killed the country’s most powerful cartel leader and one of the United States’ most wanted fugitives on Sunday, notching a major victory while cartel members responded with a wave of violence across the country. The killing of Jalisco New Generation Cartel leader Nemesio Oseguera Cervantes during an attempt to capture him in Jalisco state was the highest-profile blow against cartels since the recapture of former Sinaloa cartel boss Joaquín “El Chapo” Guzman a decade ago. Following Oseguera Cervantes’ death, gunmen unleashed violence across the country. Cars burned out by cartel members blocked roads in 20 Mexican states and left smoke billowing into the air. People locked themselves in their homes in Guadalajara, Mexico’s second-largest city and Jalisco’s capital, and school was canceled Monday in several states as security forces were placed on alert all over the country. Even Guatemala reinforced security on its border with Mexico. The killing could give the government a leg up in its dealings with the US Trump administration, which has been threatening tariffs or unilateral military action …