There are many online resources relating to the study of history during the 20th century. This list of resources, while by no means exhaustive, provides a basic starting point for research in relation to events in American History.
Offers a broad range of subject coverage in the humanities and social sciences with high-quality indexing of more than 1,300,000 articles in nearly 1,100 periodicals, dating as far back as 1907, as well as citations of over 240,000 book reviews.
Provides access to the full-text of more than 275 journals in sociology and social work. This collection provides full-text coverage of many core titles included in Sociological Abstracts and Social Services Abstracts.