When European settlers came over to the New World, they brought many diseases with them that the Native Americans had no immunity to. For this reason, they started dying from sicknesses and decrease their numbers by the millions.
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>
