Complied by the Open Education Database, lists digital collections divided into sections based on state and region.

This professional organization provides information about professional development, education resources, and publication lists.

Timeline of the Civil War created by the New York Times for the 150th Anniversary of the start of the war, includes primary sources.

Includes a digital textbook featuring primary source material, subject guides, handouts, etc.

George Washington University's College of Arts & Sciences compiles news stories in the U.S. and around the world that relate to historical events, historians, or the filed of history.

Created by National Geographic, contains primary sources.

Created by the National World War I Museum and Memorial, includes primary sources.

The National Park Service is one of the United States' leading agencies for history and culture, responsible for the protection and preservation of historical sites.

The Miller Center, a nonpartisan group dedicated to the study of the American presidency, provides a collection of resources including biographies, speeches, oral histories, and educational resources for all of the nation's presidents.

Bowdoin College's comprehensive guide outlines the process of researching, reading and writing in the discipline.