Agriculture and States
Foraging required people to constantly move on to new ecosystem to find food, while the old ones regrow and replenish themselves. As population sheered, people have to develop the agriculture, even the foraging is easier. Agriculture allows the foragers to quit migrating and settle down for several generations.
Agriculture first emerged in the Fertile Crescent in Egypt around 11,000 years ago. Then the east Asia PG around 9,000 years ago.Then in west Africa and the Americas around 5,000 years ago.
The population has grown from 6 million people at the beginning of the agriculture to 50 million by the emergence of states 5000 years ago.
Accordingly, the first states to arise were in the middle East, where agriculture first emerged.Followed by the Chinese and Indus Valley Civilization. So, the invention of agriculture was a precursor for the rise of states.
