I believe the answer is: <span>Chicago School of Sociology
According to </span><span>Chicago School of Sociology, urban environment is created by a lot of groups of people which come in together from various backgrounds. To get along in such culture, it is necessary for people to stop forcing each other to conform to their personal culture and start to develop a sense of tolerance.</span>
Due to limited land availability in South America, the South American people had to deforest the land to make more space. It promoted limited economic growth after the Second World War when South American countries took advantage of the tropical climate to grow fruits and other foods grown only in their region.
For example, Brazil has a coffee-based economy. This means that South American countries have not been able to develop as economically as the US has done for a long time.