Over the period of the Atlantic Slave Trade, from approximately 1526 to 1867, some 12.5 million slaves were shipped from Africa, and 10.7 million arrived in the Americas.
A choropleth map (from Greek χῶρος "area/region" and πλῆθος "multitude") is a type of thematic map in which areas are shaded or patterned in proportion to a statistical variable that represents an aggregate summary of a geographic characteristic within each area, such as population density or per-capita income.
Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
