The Article of Confederation made *laws almost impossible to pass* due to the lack of federal government power. The government also *lacked power to collect taxes* which left the government without money to pay off taxes.
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It represented social Darwinism, so it would be the first choice.
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.