Archaeological evidence indicates that the people of Ancient Egypt originated in the area of the Sahara Desert; but at a time when that area was a green plain There were rivers, streams, and other bodies of water which made the area habitable. There is evidence that these people grew some crops, including sorghum for food and animal feed. As the climate of the area changed, the populations of the area were forced to disperse, some to the South, others into the region of the Nile River Valley. With no evidence to the contrary, the safest assumption seems to be that the people of Ancient Egypt was similar to the Arabic people who now populate the area. Those who moved southward developed into the Nubian civilization, composed of black Africans.