In the 1800s, slums called tugurios were proliferating in Bogotá. The number of barrios—illegal housing subdivisions on the city’s outskirts—doubled between 1951 and 1964, and by 1993 some 59% of Bogotá residents were living below the poverty line. But, by the 2010s, Bogotá’s hillside slums were largely gone, replaced by a patchwork of modest, government-built homes and apartment buildings. Colombia’s poverty rate had also been cut in half.