Image Attributions:
"Benjamin Banneker and the District of Columbia" by Maxine Seelbinder (https://www.flickr.com/photos/bootbearwdc/104139985/) - dbking - License: Attribution (http://creativecommons.org/licenses/by/2.0/)
Benjamin Banneker (https://www.flickr.com/photos/crazysanmanhistory/2790036819/) - crazysanman.history - License: Attribution, Non Commercial (http://creativecommons.org/licenses/by-nc/2.0/)
Gimme Hope Obama (https://www.flickr.com/photos/screenpunk/2953374921/) - screenpunk - License: Attribution, Non Commercial (http://creativecommons.org/licenses/by-nc/2.0/)
Une Histoire des Geants du Jazz (https://www.flickr.com/photos/hansthijs/3576226050/) - Piano Piano! - License: Attribution (http://creativecommons.org/licenses/by/2.0/)
Oprah: Crazy Talk! (https://www.flickr.com/photos/askcurly/3584842677/) - ask curly - License: Attribution (http://creativecommons.org/licenses/by/2.0/)
'Naperville's Friends and Families...' River of Life No.1 -- Naperville (IL) 2011 (https://www.flickr.com/photos/22711505@N05/5818945153/) - Ron Cogswell - License: Attribution (http://creativecommons.org/licenses/by/2.0/)
Jackie Robinson (https://www.flickr.com/photos/baseballcollection/6134404446/) - Baseball Collection - License: Attribution (http://creativecommons.org/licenses/by/2.0/)
Martin Luther King Jr. and Ralph Abernathy in St. Augustine, Florida (https://www.flickr.com/photos/floridamemory/12001376733/) - State Library and Archives of Florida - License: No known copyright restrictions (http://flickr.com/commons/usage/)
Sidney Poitier and Anne Bancroft - Jet Magazine, April 30, 1964 (https://www.flickr.com/photos/vieilles_annonces/14336541107/) - vieilles_annonces - License: Attribution, Non Commercial (http://creativecommons.org/licenses/by-nc/2.0/)
Image taken from page 3 of 'Slavery: an essay in verse, etc' (https://www.flickr.com/photos/britishlibrary/11000731436/) - The British Library - License: No known copyright restrictions (http://flickr.com/commons/usage/)
Image taken from page 133 of 'The History of Troop “A,” New York Cavalry U.S.V., from May 2 to November 28, 1898 in the Spanish-American War. Published by the Troop for private circulation. [With illustrations and map.]' (https://www.flickr.com/photos/britishlibrary/11289180423/) - The British Library - License: No known copyright restrictions (http://flickr.com/commons/usage/)
Nelson Mandela: The Man the Legend (https://www.flickr.com/photos/redtouchmedia/11387242646/) - redtouchmedia - License: Attribution, Non Commercial (http://creativecommons.org/licenses/by-nc/2.0/)