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1820 CE
1830 CE
1840 CE
1850 CE
1860 CE
1820 CE: Cheyenne & Sioux alliance defeat the Crow and take the Powder River Territory.
1825 CE: Influx of white settlers into the region causes conflict.
1851 CE: Fort Laramie Treaty of 1851 defines boundaries of land for Native American nations and white settlers.
1858 CE: Pike's Peak Gold Rush ignores the Fort Laramie Treaty of 1851.
1863 CE: Bozeman Trail opened through Sioux territory without permission.
1866 CE - 1868 CE: Rain-in-the-Face is a war chief during Red Cloud's War.
1866 CE: Red Cloud launches his war against forts illegally constructed on Sioux lands.
1866 CE: Battle of the Hundred-in-the-Hands/Fetterman Massacre.
1867 CE: The Hayfield Fight of Red Cloud's War.
1867 CE: The Wagon Box Fight of Red Cloud's War.
1868 CE: Red Cloud's War concludes with the Treaty of Fort Laramie of 1868.