The International Ladies Garment Workers Union was formed in 1900, and for close to 100 years represented the interests of hundreds of thousands of workers in the women's-clothing industry. This collection of more than 1,000 photographs documents the activities of this union, which was particularly influential in the 1920s and 1930s. It includes scenes of workers in both the U.S. and Puerto Rico: at home and in shops and participating in marches, protests, celebrations, parades, and union actions. The various immigrant groups who have been involved in the industry, such as African Americans, Jewish Americans, Italian Americans, and Puerto Ricans are well represented. While some prominent labor leaders have been identified, most workers remain unidentified. The collection also includes five photographs by famed labor photographer Lewis Hine of New York street scenes from the early 20th century. More of the Kheel Center's larger collection of 33,000 photographs will be added to this website in the future.

Visitors to this site will find more than 1,000 images and dozens of videos about the history and culture of Puerto Rico. The work of dozens of scholars and contributors, the Puerto Rico Encyclopedia reflects the diverse nature of the island: a U.S. territory, a key location for trade in the Caribbean, a Spanish-speaking entity with its own distinct culture, and a part of a larger Atlantic world. Funded by an endowment from the National Endowment for the Humanities and the Fundación Angel Ramos, the site is a key product from the Fundación Puertorriqueña de las Humanidades. It provides users with all content in both English and Spanish. Educators will find the site easy to navigate and conveniently categorized by themes; within each topic, appropriate subtopics provide an in-depth examination of Puerto Rican culture and history. Of particular interest to U.S. History teachers are the images and information found under History and Archeology. Here, teachers and students can explore a chronological narrative of the island's history and role at specific moments in U.S. and Atlantic history. Other sections worth exploring are Archeology (for its focus on Native American culture), Puerto Rican Diaspora (for its look at Puerto Ricans in the U.S.), and Government (for a detailed history on Puerto Rico's unique status as a free and associated US territory). Educators in other social science courses will also find valuable information related to music, population, health, education, and local government. In all, 15 sections and 71 subsections provide a thorough examination of Puerto Rico. The Puerto Rico Encyclopedia's bilingual presentation also makes it a good site for integrating Hispanic culture into the U.S. History curriculum, as well as helping to bridge curriculum for English Language Learners (ELLs) in the classroom.

This Library of Congress American Memory site, a collaborative effort of the Library of Congress Hispanic Division and the National Digital Library Program, was created to help commemorate the centennial of the Spanish American War (1898). It traces the early history of the Commonwealth of Puerto Rico through first-person accounts, political writings, and histories.

The selections consist of 39 Spanish-language political pamphlets, 13 monographs, and one journal that highlight topics such as land, natural resources, relations with Spain, political rivalries, and reform efforts. A brief (200–250 word) summary of the item and notes about the author, publication date and place, and repository information accompany each item. The Spanish-language pamphlets are not translated into English.

The online exhibit also features reminiscences of 12 soldiers who fought in the Spanish American War. A special presentation of downloadable cartographic items from the Library's Geography and Map Division includes two maps of the West Indies dating from 1806 and 1898; seven maps of Puerto Rico (1886–1915); maps of the cities of Bayamon, Mayaguez, and San Juan, Puerto Rico; and three Puerto Rican maps from the Spanish American War era.

The site also offers links to nine other American Memory sites on related topics and a bibliography lists more than 50 related works, approximately 20 of which are suitable for younger readers. This site will appeal to a small audience because of the number of untranslated Spanish documents; additionally, the selected documents only depict a narrow slice of Puerto Rican culture and society, primarily that of political, military, and foreign relations history. But for students interested in Puerto Rican history or the history of Spanish and American relations, this is a useful site.

This exhibit collects a series of chronologies, images, maps, bibliographies, biographies, essays, and other materials for studying the Spanish-American War. An overview essay discusses the historical context, including events leading up to the war and well-known individuals such as Jose Martí and Theodore Roosevelt.

There are four main sections: Cuba, the Philippines, Puerto Rico, and Spain. Each section presents an introductory essay, a chronology, and guides to related resources. An index offers short descriptive entries on 57 people, 13 places in Puerto Rico, Cuba, and the Philippines, and 21 events. Also available are a chronology and a selected bibliography of personal narratives, illustration sources, manuscripts, and maps. Finally, there is a list of additional Library of Congress resources and relevant American Memory presentations.