The Mormon War (or Utah War) was a small scale war between the Mormons and the US government. Most of its casualties were a result of the Mountain Meadows Massacre.
When was the Mormon War?
The Mormon War was from 1857 to 1858.
What caused the Mormon War?
There were a number of causes of the Mormon War.
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There were growing tensions between Mormons and pioneers travelling through Utah.
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Most Americans objected to the Mormons' practice of polygamy.
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The US Government believed that Mormon leaders were running Utah along religious lines, supported by a paramilitary organisation called the Danites. It was felt that this undermined and obstructed the laws of the United States.
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President Buchanan wanted to replace Brigham Young as governor of Utah with a non-Mormon governor. He sent 2,500 troops to Utah, to protect the new governor and prevent trouble.
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On hearing about the approaching army, Brigham Young raised the local militia to defend Utah.