A map from 1911 of South America showing the population density across the region. The map is color-coded to show areas of population densities ranging from under 2 persons per square mile to over 256 persons per square mile. A chart at the bottom of the map shows the relational population size of the South American cities of Valparaiso, Pernambuco, Bogota, Rosario, Lima, Belem, and Porto Alegre, with populations of the time given.