Answer:
Just for now, this as Co ro na virus spread.
In general, because of the weather and overpopulation, growing risk of many diseases, especially that spread from animals to people, is always the problem for this continent.
In history, from 1970s to present, HIV-AIDs is still the big problem. There are many programs for combating the spread of HIV-AIDs, for example, the “Abstinence-Only HIV/AIDS Programs” in Uganda in the early 200x is called The Less They Know, the Better. So, the main reason why has the Ugandan government pushed Abstinence as a means of combating the spread of HIV/AIDS is: the people for whom the propaganda is done are mostly children above 10, who tend to start having sex at an early age. Uganda is home to nearly 1 million children orphaned by HIV/AIDS, many of them at high risk of HIV infection themselves.
Explanation:
Hope this idea can help you a bit.
You can assume that the location of the South American cities is near the coast because of terrain. South America is known for its rainforests and the mountain range along Chile. You can also assume that the cities are usually near the coast because of money (tourism, shipping, etc) there are not many cities in the inland areas of South America.