I think its because Brazil's coast are near the water and have good farming area, a nice breeze therefore people live near the coast leaving the inland sparsely populated.
(this answer may not be correct but its all live got) :)
Because They are so poor and they are still a developing country.
the whole country is sparsely populated
rural
Unlike the United States, the inland areas of Mexico are the most populated throughout the country.
To organize and govern sparsely populated areas
rural
the names of the countries that have sparsely & densely areas are:-1-CHINA2-JAPAN3-AMERICA4-IRAN5-SRI LANKA6-BANGLADESH
Henan is the most populated province in China.
urban relates to the area surrounding cities and well populated areas. rural relates to a sparsely populated areas, usually farmland or country areas.
Issaquena County is the least populated county in Mississippi with a population of 1,406 as of the U.S. 2010 Census.
Its length was 117 miles.The width and height varied according to what area it was in. The parts that were near heavily populated areas were higher and thicker than parts in sparsely populated areas because people would be more likely to try to escape in a heavily populated area than a sparsely populated one.
America is a large and diverse country with varying population densities. Some areas, like cities, are densely populated, while other regions, like rural areas, are more sparsely populated. Overall, the United States has an average population density that is lower than many other developed countries.