This is an oversimplification, but it is exactly what the archaeology and physical anthropology had previously told us. Except the physy and archy data give us more detail. But, important and interesting nonetheless:
Short people known as pygmies are scattered across equatorial Africa, where they speak various languages, inhabit different types of forests, and hunt and gather food in diverse ways. Despite their cultural variety, a new study shows that the pygmies of Western Central Africa descended from an ancestral population that survived intact until 2800 years ago when farmers invaded the pygmies’ territory and split them apart….