Why Did Early Empires Rise and Fall?

Why did early empires rise and fall, and what can they teach us about modern times? This Big History Project video explains:

Expansion meant the addition of new territories, resources, and people. As human societies became larger, more diverse, and more complex, they began to connect. This happened first at the local and regional levels, and eventually across continents as well. Collective learning linked more and more communities, creating an increasingly international store of shared knowledge that would provide the intellectual foundations for today’s world.

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