The New York Times TimesMachine is an excellent resource to see how events were reported on as they happened. It can be a little tricky to use, though. Some tips:
The entire run of the New York Times, starting in 1851. To use, first set up a New York Times account using your campus email. Follow these instructions. Watch a video on how to use this database.
AUTHOR
AFFILIATION
AGENDA
ACCURACY
Look for websites by government organizations, libraries, and universities; many of them provide excellent digital collections. Make sure you analyze the site closely and think critically about what it's presenting.
Primary documents, especially older written material, can be found on both Hathi Trust and Internet Archives. If you a researching a topic or a particular person, occasionally material that they wrote can be found on either on of these two sites. Try going to advanced search and switch the search to author.