Egypt, the original city-state appeared on the banks of the Nile about 3500 years ago. The legendary King Metsis of the first dynasty of Egypt unified Egypt around 3 100 BC. Next came China, which established the Xia Dynasty in 2200. Then India, then Iraq (two river basins, so Babylon). There is only one Mycenaean civilization in the legendary Greece (3500 BC). But now there are only sporadic discoveries. The Greek polis will appear in the future.