When ever they felt like it
When ever they felt like it
because they wanted to
to maintain "civilization" yes would be the answer. --civilization: a place with order.
It has a humid subtropical climate
Complex irrigation systems.
One major trend in early civilization and lifestyles was the organization of a complex institutional government and a definite social hierarchy.
Agriculture allowed early Americans to: Settle in one place instead of being nomadic. Develop permanent villages and communities. Produce surplus food, supporting population growth. Specialize in crafts and trade, leading to more complex societies. In short, farming enabled stability, growth, and the rise of civilizations in early America. See more: nsda.gov.bd/pages/files/6922d9ed933eb65569e011c7
to honor their rulers and please their gods
Mountain ranges & deserts
the rivers
the rivers
The occupied fertile river valleys, which gave them the surplus produce on which civilisation could develop.