All articles A–Z
519,064 articles
American Civil War
The American Civil War (1861–1865) was fought between the United States and eleven seceded Confederate states over the Union and slavery; the deadliest American war, with about 620,000 to 750,000 dead, ending at Appomattox with emancipation and Reconstruction.
American Civil War alternate histories
American Civil War alternate histories are fiction imagining the Civil War ending differently, chiefly a Confederate victory. One of two most popular divergence points in English alternate history; nearly 150 works from 1900 onward, peaking 1970–early 1990s.
American Civil War Museum
The American Civil War Museum, formerly the Museum of the Confederacy, is a Virginia history museum system with three sites, holding about 15,000 Civil War artifacts and 150,000 documents.
American Civil War prison camps
American Civil War prison camps were military prisons built by the Union and Confederacy between 1861 and 1865, where disease and overcrowding killed over 56,000 captured soldiers.
American Civil War reenactment
American Civil War reenactment, or Civil War reenacting, is a hobby staging re-creations of 1861–65 battles and encampments; about 35,000 US participants, born from the 1961 Manassas centennial event, organized in small local units.
American Classic (TV series)
American Classic is an MGM+ comedy-drama series created by Michael Hoffman and Bob Martin, premiering March 1, 2026. Kevin Kline plays Broadway star Richard Bean, who returns to his Pennsylvania hometown to save the family theater with an Our Town production, co-starring Laura Linney and Jon Tenney.
American Clean Power Association
The American Clean Power Association (ACP) is a United States trade association for utility-scale wind, solar, storage, and transmission companies, formed in 2021 and led by CEO Jason Grumet.
American Clinical Neurophysiology Society
American Clinical Neurophysiology Society (ACNS), formerly American Electroencephalographic Society, founded 1946; US professional society setting clinical neurophysiology standards, guidelines, and the Journal of Clinical Neurophysiology.
American Cocker Spaniel
American Cocker Spaniel (Cocker Spaniel in the US), a small AKC Sporting Group flushing spaniel developed from English stock via Obo II (1884); split from the English Cocker in 1946-47; smallest sporting breed, 10-14 year lifespan, mid-century AKC #1.
American cockroach
American cockroach (Periplaneta americana), also called waterbug or palmetto bug: a large reddish-brown peridomestic cockroach introduced to the US from Africa by 1625, living in sewers and basements worldwide.
American College of Medical Genetics
The American College of Medical Genetics (ACMG), renamed the American College of Medical Genetics and Genomics in 2012, is a US professional organization for medical genetics founded in 1991.
American College of Pediatricians
American College of Pediatricians (ACPeds), not to be confused with the American Academy of Pediatrics: a small socially conservative U.S. pediatric group founded in 2002, Atlanta-based, 501(c)(3), anti-LGBTQ positions, SPLC-designated hate group.
American College of Radiology
American College of Radiology (ACR), founded 1923, Reston, Virginia; professional society of 39,000+ radiologists, radiation oncologists, nuclear medicine physicians, and medical physicists; known for accreditation, Appropriateness Criteria, and AI quality programs.
American College of Rheumatology
The American College of Rheumatology (ACR), founded in 1934 as the American Rheumatism Association, is an Atlanta-based professional society of rheumatologists with more than 10,200 members in 2025.
American College of Veterinary Anesthesia and Analgesia
The American College of Veterinary Anesthesia and Analgesia (ACVAA) certifies veterinary anesthesia specialists, called Diplomates. Recognized by the AVMA in 1975, it was renamed in 2012.
American College of Veterinary Surgeons
American College of Veterinary Surgeons (ACVS), AVMA-recognized board certifying veterinary surgeons in large and small animal surgery. Founded 1965; about 2,687 Diplomates; three-year residency, Phase I and II exams; journal Veterinary Surgery; certification separated from membership in 2027.
American Collegiate Hockey Association
The American Collegiate Hockey Association, founded in 1991, governs non-NCAA men's and women's college club hockey in the United States, with about 450 teams across five divisions.
American colonial architecture
American colonial architecture is the umbrella term for the building traditions European settlers developed in North America from the 1620s to independence in 1783, including English, Dutch, French, Spanish, and German regional styles.
American colonial portraiture
American colonial portraiture is the painted portraiture of Britain's North American colonies from the seventeenth century to the Revolution, a luxury genre displaying the sitter's wealth and status.
American Colonization Society
The American Colonization Society (ACS), also the American Society for Colonizing the Free People of Colour of the United States, founded in Washington, D.C., in 1816, sent over 13,000 free Black Americans to the colony of Liberia, which became independent in 1847.
American comic book
American comic book: 32-page U.S. pamphlet format, Golden Age from Action Comics #1 (1938), Comics Code 1954, direct market from 1973, Marvel/DC dominance, $2.2 billion 2025 market.
American Communications Association
The American Communications Association (ACA) was a US labor union of telegraphists and radio operators founded in 1931, affiliated with the CIO in 1938, and expelled in 1950 as Communist-dominated.
American Communist Party (2024)
American Communist Party (ACP), founded July 2024 by Haz Al-Din and Jackson Hinkle, is a Marxist-Leninist party claiming to be the reconstitution of the CPUSA, associated with MAGA communism and distinct from the continuing Communist Party USA.
American Community Survey
The American Community Survey (ACS) is a monthly U.S. Census Bureau survey covering more than 40 topics, including income, education, and housing, for communities nationwide since 2005.
American Conservatory Theater
American Conservatory Theater (A.C.T.), founded 1965 by William Ball, is a San Francisco nonprofit theater and actor-training conservatory, a Tony Award winner performing at the Toni Rembe and Strand theaters.
American Conspiracy: The Octopus Murders
American Conspiracy: The Octopus Murders is a 2024 four-part Netflix docuseries directed by Zachary Treitz, following photojournalist Christian Hansen's investigation of journalist Danny Casolaro's 1991 death and the Octopus conspiracy theory.
American Contract Bridge League
The American Contract Bridge League (ACBL) is a not-for-profit organization, founded in 1937, that governs contract bridge in North America, sanctioning clubs, tournaments, and masterpoint ranks.
American Contract Bridge League club network
The American Contract Bridge League club network is about 3,200 sanctioned clubs whose duplicate games award official masterpoints, over 3 million tables of play yearly.
American coot
American coot (Fulica americana), also mud hen, a rail-family waterbird of North America that swims like a duck using lobed toes, nests over water, and is IUCN Least Concern with about 7.1 million mature individuals.
American Cordillera
American Cordillera: the continuous western mountain system of the Americas, from Alaska through the Rockies, Sierra Madre, and Central American highlands to the 4,500-mile Andes, built by Pacific subduction.