generate questions: As the number and size of agricultural societies increased, they expanded into lands traditionally used by hunter-gatherers. This process of agriculture-driven expansion led to the development of the first forms of government in agricultural centers, such as the Fertile Crescent, Ancient India, Ancient China, Olmec, Sub-Saharan Africa and Norte Chico.
Who expanded into the territory of hunter-gathers? {sep_token} What did the increase in agricultural areas produce? {sep_token} What were the Fertile Crescent and Ancient India ? {sep_token} What type of expansion was it in places like the Fertile Crescent? {sep_token} Why did agricultural societies push into hunter-gatherer areas? {sep_token}