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The event that led to the massacre at Sand Creek in 1864 was that the Militia units started a campaign against American Indians.
What happened in 1864 that led to the slaughter at Sand Creek?
Colonel John Chivington's Colorado spends massacre was a pacific social group of Southern Cheyenne and Arapahoe Native Americans at Sand Creek, in November 1864.
The Sand Creek Massacre was spark off by a long-running fight for control of eastern Colorado's Great Plains. The Militia units began a campaign against American Indians, which resulted in the slaughter at Sand Creek in 1864.
Therefore, option C is correct.
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