Courtesy of :
http://history1800s.miningco.com/homework/history1800s/library/timeline/bltimelines8.htm http://www.cs.ndsu.nodak.edu/~slator/html/blackwood/geohist.htm http://www.ukans.edu/history/VL/USA/ERAS/gilded_age.html
http://rs6.loc.gov/ammem/award97/ndfahtml/ngp_nd.html

1883