Why are there so many African blacks and so few South American blacks? Are the two latitudes similar?

Latitude is still quite different, you can see it by looking at it. Most of Africa is on both sides of the equator, not far apart, while in South America, only the Amazon region of Brazil is located near the equator, which means that only the northern part of South America can be regarded as a tropical climate. In Argentina, Chile and even the Mediterranean climate, temperate maritime climate, so the Amazon region near the equator is still very dark skin. Another reason is racial reasons. There are four kinds of people in South America, one is Mongolian Indians, who come from northern Asia with yellow skin, and the other is immigrants from Spain, Portugal, Italy and other countries in Europe. One of them is white and the other is black in Europe, and the number is relatively small. They were trafficked from Africa as slaves, and their numbers were the largest in Brazil, but few in other countries. The other is mixed-race, which is the mixed-race of all races, with the largest number.