Nique111111 Nique111111
  • 03-10-2020
  • History
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What natural boundaries helped protect the river valley civilizations?

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tsaion
tsaion tsaion
  • 03-10-2020
There were mountains, barriers, and lots of water around to prevent invasion and disease
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jonshere3 jonshere3
  • 03-10-2020
Mountains, rivers themselves, deserts, etc. A good example is the ancient Indians who were protected by the himalayas
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