Abraham Lincoln by Mathew Brady. Original public domain image from Flickr https://www.rawpixel.com/image/8799537/photo-image-face-vintage-public-domainFree Image from public domain licensePresident Lincoln, Allan Pinkerton, and Maj. Gen. John A. McCleland. Original public domain image from Flickr https://www.rawpixel.com/image/8799525/photo-image-plant-art-treeFree Image from public domain licensePhotograph of President Abraham Lincoln. Original public domain image from Flickr https://www.rawpixel.com/image/8799524/photo-image-face-art-public-domainFree Image from public domain licenseThe Rev. Jesse Jackson Speaks On A Radio Broadcast From The Headquarters Of Operation Push, 07/1973. Photographer: White… https://www.rawpixel.com/image/8765591/photo-image-vintage-microphonesFree Image from public domain licenseThe Civil Rights Act signed by president Lyndon B. Johnson and martin Luther King, Washington DC, USA - 2 July 1964 https://www.rawpixel.com/image/6111534/photo-image-public-domain-person-freeFree Image from public domain licenseThe Battle of Gettysburg, Pa., July 3rd, 1863, publisher Currier & Ives https://www.rawpixel.com/image/9183877/the-battle-gettysburg-pa-july-3rd-1863Free Image from public domain licenseAnti-Slavery Medallion by Wedgwood Manufactory (Manufacturer) https://www.rawpixel.com/image/8929685/anti-slavery-medallion-wedgwood-manufactory-manufacturerFree Image from public domain licenseMemorial Number (ca. 1890–1907) print in high resolution by Edward Penfield. Original from The New York Public… https://www.rawpixel.com/image/3007803/free-illustration-image-vintage-poster-civil-warFree Image from public domain licenseGeneral Ambrose E. Burnside. Photographer: Brady, Mathew. Original public domain image from Flickr https://www.rawpixel.com/image/8802723/photo-image-person-vintage-campingFree Image from public domain licenseJulius Caesar, Escaping from the Island of Pharos, Swims to a Boat while Holding a Letter by Boucicaut Master https://www.rawpixel.com/image/14259970/image-paper-hand-personFree Image from public domain license