Map of the United States and territories, showing the extent of public surveys and other details constructed… https://www.rawpixel.com/image/8907239/image-grid-vintage-handFree Image from public domain licenseAmerican Civil War: the free and slave states, and of the unsettled territory. Wood engraving, 1856. https://www.rawpixel.com/image/13993452/image-paper-face-world-mapFree Image from public domain license