Between 220 and 235 AD, all four of Eurasia's major empires - Rome, China, Parthia and the Kushan realm - either collapsed or suffered serious reverses. Why?
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My interview with Kyle Harper on climate, disease, and the decline of Rome:    • Plagues, an Ice Age, and Rome's Decli...  

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Chapters:
0:00 Four Great Empires
1:43 The Roman Empire
2:46 The Parthian Empire
3:51 The Kushan Empire
4:12 The Han Chinese Empire
5:00 Masterworks
6:16 Connected stories?
6:42 Climate
8:05 Disease
8:50 Conclusions