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Everything starts to grow and increase, such as power, size, states, cities, and forms of communication.
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The powerful systems of Mesoamerica and the Mayan civilization collapsed because of "overexploitation of land."
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Families and households joined communities that were located in specific states and cities, and those locations soon had population issues.
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Domestication started for creating land made by humans by destroying forests, separating rivers, and plowing land, and because of this, communities were formed.
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The four world zones were formed: Afro-Eurasian landmass, the Americas, Australia, and the islands of the Pacific
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The Silk Roads that connected China and the Mediterranean created a wide system of exchanges from Eurasia.
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Imperial states started having one ruler per large region of many cities.
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Power structures were needed to defend communities, so to do so, they were economically supported by "large concentrations of wealth found in cities."
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Canoes were formed as a new way of transportation in the western Pacific.
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When agriculture started to expand, people started to get into large communities with labor to be by the agricultural land, and those areas soon became known as states, then were divided by cities in Egypt.
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Leadership depended on popular consent that made the power structures fragile since the leaders had to be trusted by the people.
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States are powerful structures of land and cities are the smaller communities within states.
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Slaughtering animals for their secondary products in livestock became an innovation for farmers because it was a type of food with fiber and milk, and also created manure for fertilization, carrying people, and transportation of goods
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Men began to act like they were the best because their work was outside of the houses while women sit inside the houses and work there.
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Expanding ideas and ways of exchanging goods came from the improvements of small changes while handling small crops.
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Since some communities had more resources than others, those communities had power over the others, because they can get whatever they need from the weak community as a trade.
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Villages in the Algerian Era began practicing forms of agriculture (known as "horticulture") that depended on the labor of humans.
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Farming communities had environments that pathogens liked, so small epidemic diseases began spreading around more freely from region to region as populations and communities increased.