This image explains the angle, or degree, you would have to throw your weapon in order to hit your enemy at certain meters away from you. The closer they are, the less angle you would have to put on your throw. The farther they are from you, the more angle you would have to put on your throw.
Probably the main reason Africans, rather than Native Americans, became slaves in America was that D. Africans and Europeans shared immunities to Old World diseases.
