Credits
Image in the Question is from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Discovery_of_Gold_in_California…
Attributed: Architect of the Capitol
License: public domain
Image in the Explanation is from Wikimedia Commons https://commons.wikimedia.org/wiki/File:California_Clipper_500.jpg
Source: http://content.cdlib.org/ark:/13030/tf1r29p10v/?layout=metadata
License: public domain
Image in the Explanation is from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Gold_seeking_river_operations_C…
Source: Page 603
License: public domain