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Unit 4: Era 4 - Regional Webs (200 to 1500 CE)

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Societies generally grow and expand. What can we learn when they collapse? How do we restructure after a plague or a political failure? Era 4 also shines light on the so-called “Dark Age”—which may need a new name.

Era 4 Overview: Collapse and Restructuring | 4.0

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Systems Collapse | 4.1

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Systems Restructure | 4.2

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A Dark Age? | 4.3

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