There are two sites that often refer people to when I’m asked about locating copies of old newspapers. The first is the Google Newspaper Archive. The second is the Chronicling America collection from the Library of Congress. The Chronicling America collection contains more than 2,600 digitized copies of newspapers printed in the United States between 1789 and 1963. You can search through the collection according to date, state in which the newspaper was published, and keyword.
The Library of Congress hosted an online conference for teachers in the fall of 2016. One of the featured presentations of that conference was Teaching With Historical Newspapers. Chronicling America was featured in the presentation. You can watch the recording embedded below to learn how to navigate the Chronicling America collection and pick up some tips for incorporating the newspapers into your practice.