When I lived in Colombia in the late 1990s, Medellín was the murder capital  of the world, but it changed course, and it did this by deliberately investing in its low-income and most violent areas and integrating them with the middle-class ones through a network of cable cars, of public transport, and first-class infrastructure, and in the process, it dropped homicide by 79 percent in just under two decades.
Quando morei na Colômbia, no fim dos anos 90, Medellin era a capital mundial  do assassinato, mas mudou, e fez isso investindo nas áreas  mais violentas e de baixa renda e integrando-as com as de classe média por meio de uma rede de bondes, transporte público, infraestrutura de primeira, e com isso, o homicídio caiu em  79% em menos de duas décadas.