Istwa Nou

Growing food supported bigger populations, bigger populations needed more land, and land per head went further under cultivation than under foraging, so farming and herding communities kept pushing outward from wherever they began. When people moved, their speech moved with them. Language never stays still. Word meanings drift, new words get coined or borrowed, grammar shifts, and each generation pronounces the sounds a little differently. Once a single ancestral tongue was being spoken in a dozen separated districts, each district accumulated its own changes, mutual understanding broke down over the centuries, and what had been one language became a family of them. That sequence is the engine behind the linguistic map of the world. Food production drove population growth, growth drove expansion, expansion drove diversification, and the shape of each family tree records who went where and when. Niger-Congo, Nilo-Saharan and Afrasian are demographic history written in sound changes, and they cover ground no potsherd can.