Discover Puerto Rico U.S.A. Where the Americas meet (1936-1940) poster by Frank S. Nicholson. Original public domain image… https://www.rawpixel.com/image/8684154/image-flower-art-vintageFree Image from public domain licenseDiscover Puerto Rico U.S.A. Where the Americas meet (1936) poster by Frank S. Nicholson. Original public domain image from… https://www.rawpixel.com/image/8684010/image-art-vintage-public-domainFree Image from public domain licenseColumbia calls--Enlist now for U.S. Army designed by Frances Adams Halsted ; painted by V. Aderente. https://www.rawpixel.com/image/8648578/image-art-vintage-public-domainFree Image from public domain licensePinback button for CORE and Black Power, National Museum of African American History and Culture https://www.rawpixel.com/image/8846767/pinback-button-for-core-and-black-powerFree Image from public domain licenseBefore sunset buy a U.S. government bond of the 2nd liberty loan of 1917 / Eugenie De Land. https://www.rawpixel.com/image/7726439/image-art-public-domain-posterFree Image from public domain license