After the first and second World Wars, Latin America experienced a fast urbanization process due to a population shift from rural areas to city environments. In Colombia, a massive internal migration took place and thus there was tremendous urban growth.
This growth led to the development of certain cities and neighborhoods, more specifically middle- and lower-class ones. Since these areas were the most underdeveloped ones, there had to be improvements on infrastructure and urban development to allow all the incoming people a safe place to live. However, these people lacked the economic means to build their own homes and the government needed help to develop the appropriate infrastructure. Thus, international help from professionals was needed. (Peña Rodriguez, Martha Liliana).