Generally speaking, South America has a much higher population density than Africa. South America has an average population density of about 28 people per square kilometer, while Africa has an average population density of about 40 people per square kilometer. This difference is largely due to the fact that South America has a much larger population than Africa, with a population of over 420 million compared to Africa's population of over 1.2 billion. Additionally, South America has a much higher urbanization rate than Africa, with over 80% of its population living in urban areas compared to Africa's urbanization rate of around 40%. This higher urbanization rate has led to a higher population density in South America, as cities tend to have higher population densities than rural areas.