1Library of Congress
2Alamy
3National Archives
4Image courtesy of Wilson’s Creek National Battlefield
5New York Public Library
6Library of Congress
7City of O’Neill, Nebraska
8Library of Congress
9Getty Images
10Library and Archives Canada
11Library and Archives Canada
12Twenty-five Years in the Secret Service (1892)
13McCord Museum
14Frank Leslie’s Illustrated Newspaper
15McCord Museum
16Library and Archives Canada