• American Memory Project from the Library of Congress --thousands of documents, photos, maps, films, sound recordings, etc. from the collections of the Library of Congress, including women's suffrage, African-American pamphlets, George Washington's letter books, life histories from the WPA, American Revolution broadsides and much more.
• Avalon Project at the Yale Law School
• Cornell Making of America Digital Library
• Documents for the Study of American History
• Duke University-Special Collections
• Electronic Text Center
• Electronic Texts
• Famous Trials
• Historic Audio & Video Archives from Webcorp Multimedia
• Historical Text Archive
• Internet Archive of Texts and Documents: The United States
• JSTOR
• Making of America
• New Deal Network
• Online Speech Bank
• Primary Sources Research Colloquium
• Scholarly Resources Microfilm

Civil War History

• American Civil War
• From Revolution to Reconstruction
• Secession Era Editorials Project
• U.S. Civil War Center

African American History

• Africans in America
• Documenting the American South
• Dred Scott Digital Archive
• Exploring Amistad Race and the Boundaries of Freedom in Antebellum Maritime America
• Freedmen and Southern Society Project
• Freedom's Journal
• Race and Place: African American Community Histories
• Roanoke Island Freedmens Colony
• Southern Oral History
• Tangled Roots

Native American History

• American Native Press Archives
• Kappler's Indian Affairs, Laws, and Treaties
• National Archives Records of the Bureau of Indian Affairs
• National Archives Records of the Indian Claims Commission
• Native American Documents Project
• Plains Indian Ledger Art Digital Publishing Project

Military History

• Air Force Historical Research Agency
• U.S. Army Center of Military History
• U.S. Army Military History Institute
• U.S. Navy History
• The Wars for Viet Nam

Colonial History

• Colonial Williamsburg History Explorer
• Plymouth Colony Archive Project
• Salem Witchcraft Trials
• Virtual Jamestown

US Government History

• Central Intelligence Agency - Electronic Document Release Center
• Core Documents of U.S. Democracy
• FBI - Freedom of Information Act - Reading Room
• Federal Land Patent Records
• FedStats
• Foreign Relations of the United States
• National Security Archive
• Oyez: Supreme Court Multimedia Database
• Resources for the Study of International Relations and Foreign Policy
• Supreme Court Opinions
• United States Historical Census Data Browser

Presidential History

• Abraham Lincoln Online
• Franklin D. Roosevelt Library and Digital Archives
• George Washington Papers
• Project Whistlestop
• THOMAS -- Legislative Information from the U.S. Congress on the Internet
• White House Historical Association

Immigration & Genealogy

• American Family Immigration History Center
• Genealogy Resources on the Internet
• Rootsweb
• USGenWeb Project

Women's History

• Elizabeth Cady Stanton and Susan B. Anthony Papers Project Online
• Women and Social Movements in the United States, 1830-1930
• Women's Studies: Women in the Jewish Community
• Worcester Women's History Project

Western US History

• America, Russia, and the Meeting of Frontiers
• New Perspectives on the West
• The Oregon Trail
• Web de Anza: An Interactive Study Environment on Spanish Exploration and Colonization of "Alta California" 1774-1776
• WestWeb: Western History Resource