Human: What are some good sources for learning about the history of the United States? Assistant: 

1. The National Archives and Records Administration (NARA) is a great source for researching American history.
2. The Library of Congress has a wealth of resources, including books, manuscripts, photographs, films, maps, and more.
3. The Smithsonian Institution also has an extensive collection of artifacts related to American history.
4. The National Park Service maintains many historical sites throughout the country that provide insight into the past.
5. Historical societies in each state can be invaluable resources for finding out more about the local history of your area.