Prehistory
The earliest known hominids in North Africa arrived around 200,000 BC. Through most of the Stone Age the climate in the region was very different than today, the Sahara being far more moist and savanna like. Home to herds of large mammals, this area could support a large hunter-gatherer population and the Aterian culture that developed was one of the most advanced paleolithic societies.
Various populations of pastoralists have left paintings of abundant wildlife, domesticated animals, chariots, and a complex culture that dates back to at least 10,000 BCE in Northern Niger and neighboring parts of Algeria and Libya. Several former northern Nigerian villages and archaeological sites date from the Green Sahara period of 7,500-7,000 to 3,500-3,000 BCE
In the Mesolithic, the Capsian culture dominated the region with Neolithic farmers becoming predominant by 6000 BC. Over this period, the Sahara region was steadily drying, creating a barrier between North Africa and the rest of the African continent.
The Nile Valley on the Eastern edge of North Africa is one of the richest agricultural areas in the world. The desiccation of the Sahara is believed to have increased the population density in the Nile Valley and large cities developed. Eventually Ancient Egypt unified in one of the world's first civilizations.
Read more about this topic: History Of North Africa