During the Neolithic revolution, people started settling in river valleys and establishing cities because they developed agriculture. It was of extreme importance for the development of human society because things like states were established and laws and people started developing basic science and things like that. Just look at how Egypt and Mesopotamia developed and how they influenced many other nations that came later.
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Even before this spirit spread to Mexico, California felt the effects of the ... In 1808, Spain's American colonies, one by one, began to fight for independence. ... and American Rivers
Explanation:
3 4 5 6 are all correct because you said so
