Trade stops being an arm of the palace and becomes a trade

The phrase commercial revolution names one specific change. Before it, long distance trade was run by agents of kings and agents of temples, moving goods on behalf of an institution that owned them. After it, an independent class of merchants supplied and carried the goods, on their own account and at their own risk. Economic historians have long recognised this shift in the ancient Mediterranean and the Levant as a turning point, the moment trade stopped being an extension of state power and started generating wealth, rank and political weight of its own. The same structural change occurred in the West African savanna during the same broad period, and it happened there independently. West Africa produced merchants, networks and towns organised around exchange rather than royal decree. If a merchant revolution can occur twice, in two places out of contact with one another, then it is a recurrent thing that human societies do. Africa was doing it on schedule.

Around 1000 BCE Ortoiroid communities completed a long movement up the Lesser Antilles and reached Puerto Rico. Their arrival brought them within reach of a different world. Hispaniola, immediately west across the Mona Passage, was held by Casimiroid peoples who had entered the islands from another direction entirely and had been there for thousands of years. The two now shared a frontier. Rouse reads the archaeology of the following centuries as a flow of technique running northwest to southeast, from the Casimiroid side into the Ortoiroid one, carrying ways of flaking and grinding stone. That direction is the interesting part. The newcomers coming up the chain were the ones learning. Whatever the older population of Hispaniola had worked out about local stone over several millennia of residence was worth adopting, and it moved across the passage into Puerto Rico. The Mona Passage has been a channel of exchange for three thousand years, and Haiti sits on the western side of it.

Two sites carry the earliest known evidence of iron smelting on earth. One is Ôboui, in the west of the Central African Republic. The second, Gbatoro, lies about a hundred kilometres away over the border in Cameroon. Radiocarbon puts both at 1800 BCE or earlier. The excavation reports describe careful work on undisturbed ground, with clean layers sealing the deposits above and below. At Ôboui the whole sequence of the craft is present in one workshop: furnace structures, the clay tuyeres that fed air to the fire, pieces of worked iron, slag, stone anvils for hammering, and charcoal in quantity for dating. Four thousand years ago, in the middle of Africa, people were smelting and forging iron. These are not stray dates from a thin dig. They are two sites, both inside the zone the linguistic evidence had already predicted, both fully excavated and both dated. African iron is older than Anatolian iron by at least three centuries.

Metallurgy is usually taught as a ladder. People start with copper, which melts at a low temperature and sometimes shows up as visible metal in rock, and only later work out that fiercer heat will pull iron out of ore. Across large parts of Africa the ladder has its rungs in a different order. In the earliest ironworking areas, in the Central African Republic and across most of the continent below the Sahara, iron was known and used before copper was. Prior copper smelting cannot be the explanation for the African discovery, because there was no prior copper smelting. Something else supplied the knowledge, and the likeliest candidate is ceramics. Women had been firing clay in high heat for thousands of years by then, and the control of temperature and airflow that pottery demands is most of what a smelting furnace needs. The African road to iron went through the kiln. The Bronze Age that world history courses treat as a universal stage never happened here.