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The sioux indian attacks on stagecoach lines.
<span>The causes of the Sand Creek massacre
were rooted in the long conflict for control of the Great Plains of
eastern Colorado. The Fort Laramie Treaty of 1851 guaranteed ownership
of the area north of the Arkansas River to the Nebraska border to the
Cheyenne and Arapahoe -that part was sighted off history.com- </span>
The passage of the Chinese Exclusion Act<span> came after a long period of anti-</span>Chinese <span>discrimination. ... The </span>Chinese Exclusion Act<span> of 1882 was one of the first pieces of legislation passed by the United </span>States<span> government to legally discriminate against the </span>Chinese<span> people.</span>
They did not want to travel long distances.