Cultures change, collide, and sometimes fuse, yet there is a direction to the long arc: increasing complexity and integration. Small isolated worlds get pulled into larger systems.
History can be read as convergence. As trade, migration, and empire expand, local customs are pressured to translate into shared tools: coins, contracts, calendars, scripts, and rules that strangers can recognize.
This does not mean life becomes uniform. It means the space of possible cultures narrows, because coordination requires compatibility. A village can live by its own myth, but an empire needs taxes, roads, and administration. A global economy needs standard measures, credit, and legal predictability.
The arrow is not toward “better,” but toward connected. Connectedness amplifies power, spreads ideas, and also spreads damage. Once linked, no society remains purely itself.