Several major cities have canceled Cinco de Mayo celebrations because of increasing fears over President Donald Trump's crackdown on immigration.Why It Matters Cinco de Mayo is a Mexican holiday that commemorates Mexico's victory over Napoleon III's French army in the Battle of Puebla in 1862. It has become a significant celebration of Mexican culture and heritage in the United States. Trump, who returned to office in January, has vowed to carry out the largest mass deportation program in U.S. history, and his hard-line immigration crackdown has sparked fear within migrant communities. In Chicago, the annual Cinco de Mayo parade, which...