This page has a lot on it. You can use the following anchors (links down the page) to jump straight to a relevant box.
JSTOR is all full-text, and very good for retrospective research in history. But, it does not include all the current scholarship indexed in America: History & Life or Historical Abstracts.
Project MUSE provides full-text access to a large number of scholarly journals in the humanities and social sciences published by over 120 of the world's leading university presses and scholarly societies. In addition, UPCC Book Collections on Project MUSE, launched in January 2012, offer book-length scholarship, fully integrated with MUSE's scholarly journal content. The Project Muse platform allows searching of books and journals in one place.
Historical Abstracts is the corollary index of journal articles, book chapters, book reviews, and dissertations pertaining to the study of World History (Europe, Asia, Middle East, Africa, Latin America), time period coverage from 1450 to the present. Publication coverage is 1955–present.
America: History & Life is the premier index of journal articles, book chapters, book reviews, and dissertations pertaining to the study of United States and Canadian History, time period coverage from prehistory to the present. Publication coverage is 1910–present.