Created by a nonprofit group interested in "open debate on federal, state, and international tax policy," this site furnishes an eclectic range of primary and secondary resources on the history of American taxation. "Tax History Museum" currently offers a 23,000-word narrative in eight chronological segments summarizing tax policy and politics from 1660 to 1900, supplemented with 70 images and links to related documents. The 20th-century portion is in development. "The Price of Civilization" makes available 14 posters and more than 6,500 pages of federal documents—primarily Treasury Department reports—on the development of the current tax system during the Great Depression and World War II. "Presidential Tax Returns" includes returns of recent presidents and Vice President Cheney. "Taxing Federalism" features nine Federalist Papers, and "Image Gallery" offers 15 political cartoons from the turn of the century to 1947, many by Washington Star cartoonist Clifford Berryman. The site also offers a bibliography and four sound clips of federal officials discussing tax policy.

Each year since 1972, CQ Press has published a book of 100 significant documents in U.S. history accompanied by detailed annotations. The entire collection is available on this website, allowing for detailed keyword searching. Documents include U.S presidential speeches, government and international organization publications, legal decisions, scientific findings, and cultural discussions. The documents are grouped by year and by topic. Topics include the economy, defense, the environment, health care, international affairs, and life in America. A "Favorite Documents" feature allows users to mark and collect documents of interest, and a "CiteNow!" feature provides citations on demand. Though the depth of documents on any one topic is minimal, this website provides an overview of important events in a given year as well as U.S. perception of and response to topics over time.

The presidency of Harry S. Truman is addressed through these hundreds of government documents, oral histories, photographs, and political cartoons. Materials cover topics including the Berlin airlift, the decision to drop the atomic bomb, desegregation of the Armed Forces, the election campaign of 1948, the Korean War, the Marshall Plan, NATO, the Truman Doctrine, Truman's Farewell Address, the recognition of the State of Israel, the United Nations, and the incarceration of Japanese Americans during World War II. Transcripts are available for approximately 120 oral histories conducted with members of Truman's administration and officials from other countries on the Korean War. The website also offers the full text of Truman's diary from 1947; more than 50 audio files with extracts of speeches, press conferences, and interviews; and more than 31,000 biographical photographs.

On March 25, 1911, a fire broke out at the Triangle Shirtwaist Factory in New York City causing the deaths of 148 garment workers—an event that came to be known as one of the hallmark tragedies of the industrial age. This website tells the story of the fire in six chapters: Introduction; Sweatshops and Strikes; Fire; Mourning and Protest; Relief Work; and Investigation, Trial, and Reform.

The text, targeted to a middle and high school audience, is accompanied by numerous primary sources that could be of use to more advanced researchers. These include close to 70 photographs, 18 newspaper articles, 17 testimonials, three oral histories, excerpts from investigative reports written in the years following the fire, several letters from witnesses, a lecture given by Secretary of Labor Frances Perkins in 1964, and a radio drama reenacting the event. Accompanying these primary sources is a list of victims and witnesses, a selected bibliography of works surrounding the fire, and tips for writing a paper.

This collection of documents—roughly 3,800 pages of court proceedings—concerns the Haymarket Affair. This watershed event in the history of American radicalism led to the first "Red Scare" in America. Materials include autobiographies of two of the eight anarchists tried for conspiracy in the murder of seven Chicago police officers. The officers died after a bomb exploded at an anarchist meeting in May 1886, the day after two workers died in a struggle between police and locked-out union members at the McCormick Reaper factory. Four defendants were executed, despite lack of evidence connecting them to the bombing. The site presents approximately 221 newspaper clippings, 55 photographs, 19 letters, nine broadsides, and images of more than 20 artifacts. A linked exhibition, "The Dramas of Haymarket," furnishes a historical narrative and contextual interpretation. This website is valuable for the study of late 19th-century American radicalism, law enforcement, and political climate.

Covering the years from 1848 to 1921, this website presents materials from the suffrage movement in America, including 167 books, pamphlets, handbooks, reports, speeches, and other artifacts totaling some 10,000 pages. Formed in 1890 from two rival groups, the National American Woman Suffrage Association (NAWSA) orchestrated passage of the 19th Amendment in 1920 through state campaigns. Materials include works by Carrie Chapman Catt, the Association's longtime president, as well as from other officers and members, including Elizabeth Cady Stanton, Susan B. Anthony, Lucy Stone, Alice Stone Blackwell, Julia Ward Howe, Elizabeth Smith Miller, and Mary A. Livermore. There are two bibliographies, an essay on Catt, a timeline, and links to 18 related collections, most of them associated with the Library of Congress American Memory.

Hundreds of documents and thousands of images relating to World War I, with particular emphasis on military, diplomatic, and political resources, are available on this website. Documents are arranged chronologically and by type, including more than 100 official documents from 16 countries, 100 personal reminiscences, and 24 treaties from 1856 to 1928. A photo archive provides 1,844 images in 15 categories, including individuals, locations, heads of state, commanders, refugees, and war albums. The website also offers substantial sections on the maritime war and the medical front, an alphabetical bibliographical dictionary with over 200 names, and approximately 125 links to related sites. The authors—volunteers from a World War I electronic discussion network—encourage user participation in expanding the site.

Focusing on the experiences of Africans and African Americans in New York City, this collection presents nine galleries that explore various themes and time periods in the history of slavery. These include the Atlantic slave trade; slavery in Dutch New York; the growth of slavery in British Colonial New York; freedom for blacks during the Revolutionary War; the Gradual Emancipation Act of 1799; free blacks in public life; Emancipation Day (July 4, 1827), and the history of scholarship on slavery in New York City. Each gallery has three panels: a gallery overview, a main thematic presentation, and one focusing on people, places, and documents. Of special interest are two interactive maps with timelines in the Dutch New York gallery and the Revolutionary War gallery; a picture gallery on the portrayal of blacks in New York City's public life; and profiles of nine African Americans who lived in New York City during the early republic.

These Territorial Kansas collections convey the growing divisions in Kansas and the nation over the expansion of slavery, federalism, nationalism, industrialization, and changing political coalitions in Congress. Materials include government documents, diaries, letters, photographs, maps, newspapers, rare secondary sources, historical artifacts, and images of historic sites. The website is divided into five sections: Territorial Politics and Government; Border Warfare; Immigration and Early Settlement; Personalities; and National Debate about Kansas. Each is searchable by keyword, author, and county. Topical sections are subdivided into relevant themes and include an introductory essay. Visitors will find essays on territorial politics, the rights of women and African Americans, military organizations, and free state and pro-slavery organizations. "Personalities" lists 32 individuals, including John Calhoun, and the final section presents both anti-slavery and pro-slavery perspectives of the national debate about Kansas. The site also includes a timeline with links and an annotated bibliography.