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in which century is 1976
20th
in which century is 2025
21st
in which century is 715
8th
three main historical eras
ancient, medieval, modern
two historical eras we are studying this year
medieval, modern
characteristics of early complex societies
writing, division of labor, cities, technology, government, culture
four oldest complex societies
mesopotamia/fertile crescent, egypt, india, china
why did they start near rivers
transport, hygiene, defense, fishing, irrigation