America: History and Life and Historical Abstracts are the two major databases in history research. Your search should start with these resources.
Other databases can be useful in historical research, especially for Interdisciplinary topics.
Library databases can be full-text where PDFs are included in the article citation or Indexes where need to locate articles other ways since the PDF is not linked.
The library offers services to help you make the connection from these Index databases to the article you need: