Delaware, Kentucky, Maryland, Missouri, West Virginia its a popular belief that it was these states
A concept that medieval England had was common law, which is the same that we share in the U.S government. Common law is one of the main pillars of the government.
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Answer:
I would say what was most important would be the adoption of agriculture. Humans no longer had to move around and spend their days solely focusing on finding food. Being able to settle down and make one's own food allowed humans to have free time, and create hierarchies and languages and art, creating societies and civilization.