On Wednesday, thousands of people packed Paulista Avenue, in central São Paulo. Many were there to celebrate the impeachment of Dilma Rousseff, Brazil’s first female President. They posed for photographs while holding plastic champagne flutes and servings of cake with yellow, green, and blue frosting—the colors of the Brazilian flag. Meanwhile, many others had turned out to condemn what they called a golpe: a coup. Earlier in the day, the country’s senators had voted overwhelmingly to remove Rousseff from office, but this apparent consensus belied a deep national rift, and on the street the crowds were bitterly divided. As night fell, lines of riot police separated the opposing groups, and officers used tear gas to disperse anti-impeachment demonstrators.