MEXICO CITY — Mexican President Claudia Sheinbaum has repeatedly insisted that she will not allow the U.S. military to fight drug cartels inside her nation’s borders. “It’s not going to happen,” Sheinbaum said last month after President Trump yet again threatened such an operation. “We don’t want intervention by any foreign government.” But while Sheinbaum passionately defends her nation’s sovereignty, recent polls and interviews from across Mexico show that a significant number of people here