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The largest civil engineering project in western history to that date, the railroad was over 4,800 km/3,000 mi long and crossed deserts, canyons, and mountains, requiring the development of new construction techniques.
Slaughter of 450 Cheyenne and Arapaho by the 3rd Colorado Volunteers under Col John Chivington, during an unprovoked attack on Cheyenne peace chief Black Kettle's camp at Sand Creek, Colorado, on 29 November 1864.
The Battle of the Little Bighorn took place on 25 June 1876. It resulted in the death of about 265 officers and troops of the 7th Cavalry under the command of General George Armstrong Custer. The battle was the most serious defeat of the US army during the war for the Great Plains.
Sometimes called ‘the War Between the States’ or ‘the Second American Revolution’, a conflict in the USA which resolved two great issues: the nature of the Federal Union and the relative power of the states and the central government; and the existence of black slavery.
Case decided in 1819 by the U.S. Supreme Court, dealing specifically with the constitutionality of a Congress-chartered corporation, and more generally with the dispersion of power between state and federal governments.