Diseases, Because the weapon that the Native Americans had no resistance to that killed THE MOST Natives were the new diseases that were introduced. Yes the diseases weren't new to the Europeans because they had built up immunity. but the Natives had no such immunity and it killed them like wildfire.
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Wovoka and his ghost dance became so popular among Indian tribes in the Southwest because they believed that the ceremony would reunite the spirits of the dead with those of the living, and the power of these spirits could be harnessed in battle with white settlers and the US Army
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