ABSTRACT
Within the past few chapters we have reviewed some remarkable achievements and inventions of our ancestors. Migrants from Africa settled new and different lands. Their distant descendants domesticated plants and animals, and created improvements in oceanic and land transport. Still later generations created metallurgy, writing, and states, and elaborated formal systems of philosophy, religion, and commerce. Along with these developments expanded that dubious but influential activity, warfare. All of these changes have drawn on migration, and all of them have generated new sorts of migration.
