By Daniel R. Blume from Orange County, California, USA (A stack of newspapers) [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons
Below are some key databases for finding US newspaper articles:
Some historical newspaper issues are available in the library on microfilm. You can find these in MultiSearch by searching for individual titles.
Many historical newspapers are now available online, through different digitisation projects. Some sources for American newspapers online are: