Primary source (or historical) newspapers from the United States are widely accessible online, both from our library's licensed databases (e.g., the Historical NYT) and from the open websites of other libraries (e.g., Chronicling America).
Please visit my extensive list of historical newspapers from the History libguide. Specifically, go to the Primary Sources Online page of that guide. Click on the Periodicals tab. Once that tab opens, focus on the newspaper projects and titles listed under United States and New Jersey.