Before the fourth millennium, Egypt was grassland and the river was a hazard

The image of Egypt as a narrow green ribbon of farmland cut through desert describes a landscape that only came into being late in the fourth millennium BCE. For the four thousand years before that, from the tenth millennium to the seventh, the picture was reversed. Vegetation and wildlife spread across the Sahara, which opened enormous stretches of country away from the river to people collecting wild grain and hunting. On the Nile itself flood levels ran high enough that the banks were largely abandoned early in the Holocene. So the communities laying the cultural groundwork for what became Egypt were steppe people. They lived on grassland that ran west and east of the river and joined without a break to the Sudan in the south, and they would not have recognised the country the pharaohs later governed. The gift of the Nile describes the position Egypt was forced into by drought. It says nothing about where Egypt came from.

Trinidad stayed joined to the South American mainland until the Holocene, and the consequences are still visible in what lives there. Its plants and animals are continental in range, and the island holds a long list of species that never reached the rest of the Antilles. It covers about four thousand eight hundred square kilometres, which makes it the sixth largest in the chain. Most of it is low hills and badly drained lowland, with a rough northern coast as the exception. That combination of position and biological range is why archaeologists routinely call Trinidad the gateway to the Caribbean. It is worth being precise about what the label means. Anything moving out of the Orinoco country and into the island chain had to come this way, so the settlement history of every island downstream begins with what people were doing here. A Caribbean that starts in 1492 skips the door and describes only the room.

The third independent invention of ceramics in the world belongs to Africa. By eleven and a half thousand years ago, around 9500 BCE, people in what is now Mali were making pots. The country in question lies south of the great bend of the Niger, and it falls inside the region where the ancestral form of Niger-Congo would have been spoken, the homeland of the largest language family on the continent today. Twelve thousand kilometres separate it from the Yangtze, which rules out anyone carrying the idea across. This is a dated, located archaeological finding and it has been available for years. Potters in western Africa were firing clay thousands of years before anyone in the Near East or in Europe did. The interesting question is no longer whether it happened. It is why a world history syllabus that has had this information for a generation still opens the story of ceramics in Mesopotamia and never gets to Mali at all.

Across the societies that speak Nilo-Saharan languages, the divine is understood as a single pervasive Spirit Force. Anthropologists working in a range of these communities settled on the word Divinity for it. The names used follow a consistent pattern: they tie Divinity to the sky, and through the sky to rain and often to lightning. People do call on particular named spirits for help, and they understand those spirits as manifestations of the one Divinity rather than as separate beings with standing of their own. Western theology has a term for exactly that relationship between the one and its appearances, hypostasis, and it took several centuries of argument to arrive at it. The Nilo-Saharan conception traces back to the ninth millennium BCE. It is a complete system with its own internal logic, and it sits alongside the Creator God of the Niger-Congo tradition as the second monotheism worked out in Africa long before comparable ideas surface anywhere in the Middle East.