Historical Abstracts™ is an exceptional resource that covers the history of the world (excluding the United States and Canada) from 1450 to the present, including world history, military history, women's history, history of education, and more - essential for libraries supporting upper-division and graduate research. (This might be a good place to keyword search American Revolution anyway though to get a European perspective)
A master index to every literary series published by Gale combines and cross references more than 130,000 author names including pseudonyms and variant names and more than 140,000 titles into one source.
If you need help with your history research, sign up for a one-on-one Student Research Consultation (SRC) with a reference librarian who can help guide you through your research project.
18th Century Newspaper & Magazine Articles (Primary Sources)
Some of the research tools listed below have the full text of primary sources and some will help you identify primary sources that you then need to request via the IDS service.
Indexes Time, The Wall Street Journal, The New York Times, The Guardian and The Washington Post, some magazines, and aggregators including Factiva, LexisNexis, Thomson Gale and HighBeam Research, offfering citations and some content free, with links to free and fee-based content.