There's no one thing, but for historians, it's generally something that was created at the time of the event. Try searching using terms like: biography [also use for autobiographies], newspapers, "personal papers" [use for archival material], correspondence [use for letters], personal diaries, photographs, videos, interviews, pamphlets, artwork, sources [a common one!], and many other types of things!
1. Do an author search (with facets) for persons, organizations, or group central to your topic.
2. Do a keyword search for words that signify primary source (source, letters, narrative, laws) and words that represent your topic.
3. Do a subject search using a subject heading, then limit your search to publications produced during the era you are researching.
The Center for Research Libraries has a number of microfilmed collections, international newspapers, and official documents from countries outside the U.S.
The 1619 Project is an initiative from The New York Times observing the 400th anniversary of the beginning of American slavery. It was originally published as an interactive website and an August 18th special issue of the New York Times Magazine.
Questions? Contact firstname.lastname@example.org
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