Camp scene in the Mojave Valley, Rio Colorado, 1853-1855.

UNITED STATES - JULY 16: Native Americans, with US soldiers in the distance, in Nevada or California, drawn by Lt J C Tidball of the 2nd Artillery. Illustration from �Reports of explorations and surveys: to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean� published by the United States War Department in 1856 and 1860. This work reported on the topographical features and geology of the country, and on the Native American tribes inhabiting it. (Photo by SSPL/Getty Images)