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 interpretive essay, more than 10,000 words, on the culture wars of the 1910s and 1920s, is organized into four sections. It offers 34 documents and 75 images—photographs, cartoons, posters, flyers, and maps—to provide historical context and connections between seemingly unrelated phenomena. "Prohibition" includes an exhibition of photographs, political cartoons, and documents from the Ohio Dry Campaign of 1918. "Anti-Immigration and the KKK" presents a Klansman's manual, anti-immigration magazine articles, and the text of the Immigration Act of 1924. "The New Woman" contains sections on image and lifestyle, sexuality, opposition, the African American New Woman, and work, education, and reform. "The Scopes Trial" includes documents on fundamentalism and evolution and trial transcripts. The website provides 28 related links and bibliographies of 42 titles. This valuable site emphasizes the complexity of conflicts persistent throughout 20th-century American history.

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.

Nearly 4,000 panoramic photographs of cityscapes, landscapes, and group portraits, deposited as copyright submissions by more than 400 companies, are displayed on this site. Panoramic photographs were used to advertise real estate and to document groups, events, and gatherings. Images depict all 50 states, the District of Columbia, and more than 20 foreign countries and territories. Subjects include cityscapes, landscapes, group portraits, agricultural life, disasters, education, engineering, fairs and expositions, industrial scenes, military activities, performing arts, sports, and transportation. Although the images cover the period from 1851 to 1991, the collection centers on the early 20th century. The site includes a bibliography, an illustrated 1,000-word background essay on the history of panoramic photography, and an essay outlining the technicality of shooting a panoramic photograph. Four essays focus on specific photographers: George R. Lawrence (1869–1938); George N. Barnard (1819–1902); Frederick W. Brehm (1871–1950); and Miles F. Weaver (1879–1932).

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.

The Detroit Publishing Company mass produced photographic images—especially color postcards, prints, and albums—for the American market from the late 1890s to 1924. This collection offers more than 25,000 glass negatives and transparencies and about 300 color photolithographs from this company. It also includes images taken prior to the company's formation by landscape photographer William Henry Jackson, who became the company's president in 1898. Jackson's work documenting western sites influenced the conservation movement. Although many images were taken in eastern locations, other areas of the U.S., the Americas, and Europe are represented. The collection specializes in views of buildings, streets, colleges, universities, natural landmarks, and resorts, as well as copies of paintings. Nearly 300 photographs were taken in Cuba during the Spanish-American War. About 900 Mammoth Plate Photographs include views of Hopi peoples and their crafts and landscapes along several railroad lines in the 1880s and 1890s.

The Naval History and Heritage Command collects, preserves, and presents the history of the U.S. Navy in physical locations throughout the U.S. and online. Teachers will be most interested in "Resources & Research," a rich collection of primary and secondary sources related to naval history, including photographs, paintings, documents, oral histories, historical overviews, chronologies, and bibliographies. Teachers may want to start with "Photograpy," "Web Exhibits," or "Commemorations," some of the richer and more navigable sections. "Photography" features an online library of selected images on subjects including recruiting posters, albums and scrapbooks, women in the U.S. Navy, aircraft, naval insignia, individual ships, and more. "Web Exhibits" gathers together more than 20 curated collections of resources on topics from the Civil War to Japan/U.S. Navy relations; resources vary by exhibit but include documents, photographs, videos, related articles, oral histories, and links to off-site resources. "Commemorations" features collections of resources related to specific events, including the bicentennial of the War of 1812, the sesquicentennial of the Civil War, the Battle of Midway, and the 1941 attack on Pearl Harbor. Teachers may also find unique primary sources in "Art." The Naval Art Gallery offers more than 25 galleries including "Women in Uniform" and "The Invasion of Normandy." Additionally, the "Archives" section provides downloadable Commander Naval Forces Vietnam (COMNAVFORV) monthly summaries from 1966 to 1973 and links to other archives holding material on the U.S. Navy. "Navy Department Library" makes available naval documents from 1775 to the present day (note that the documents are presented chronologically by topic, with no distinction between primary and secondary sources). "Diversity" directs visitors to collections on women, African Americans, Asian and Pacific Islander Americans, Hispanic Americans, and Native Americans in the U.S. Navy. "Videos" indexes more than 90 video clips, some primary sources and some secondary. "Ships Histories" provides brief histories of specific ships, indexed by name, and "Aviation" provides data on different types of aircraft and aircraft carriers. "Bios" features more than 100 essays with images on naval figures. Teachers will need patience to navigate the site and uncover the primary sources available.