When using any image from the online resources listed, make sure you click on the site's "Rights and Clearance" or "Terms and Conditions" section to make sure you are following proper usage policies.
When using images from the databases, sometimes you may use them for educational purposes [as long as you cite them properly and give credit (i.e. in a presentation)]; but, many images are still copyrighted, so always check their usage policies, too.
American Memory provides free and open access through the Internet to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience. It is a digital record of American history and creativity. These materials, from the collections of the Library of Congress and other institutions, chronicle historical events, people, places, and ideas that continue to shape America, serving the public as a resource for education and lifelong learning.