The hobby in N Europe for centuries was, after spring planting, get the weapons and invade your neighbors. Kill as many as possible, rape as many as possible, take anything of value and a few slaves, and head home for harvest. Next generation was your neighbor , after spring planing, invading your little piece of heaven and returning the favor. In a large part of the world, the Roman army, with members from everywhere, did the invading and raping. England was invaded by everyone. Your blood lines will be mixed. And now, it seems that the oldest body dump in England (Cheddar man) had really dark skin. We have common ancestors, but we just don't like the neighbors. Fear of the stranger, and humans can be strange.