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United States in the Korean War
The United States in the Korean War (1950–1953) covers America's role leading the UN defense of South Korea, deploying over 325,000 troops before the 1953 armistice.
United States in the Vietnam War
The United States in the Vietnam War refers to American involvement in the conflict between North and South Vietnam, with combat troops from 1965 to 1973.
United States in World War I
United States in World War I: American neutrality, April 1917 entry as an Associated Power, AEF mobilization of 4.8 million men, home-front agencies, and the war's domestic aftermath through 1920.
United States incarceration rate
The United States Incarceration Rate, defined by the Bureau of Justice Statistics (BJS), counts residents held in local, state, or federal facilities per 100,000 U.S. residents.
United States Indo-Pacific Command
United States Indo-Pacific Command (USINDOPACOM, INDOPACOM), also U.S. Pacific Command (USPACOM), is the oldest and largest U.S. unified combatant command, established January 1, 1947, headquartered at Camp H.M. Smith, Hawaii, renamed Indo-Pacific in 2018 and back to Pacific Command in 2026.
United States Information Agency
United States Information Agency (USIA), independent U.S. public diplomacy agency established 1953, briefly renamed USICA 1977-1982, abolished October 1, 1999 with functions split between the State Department and the Broadcasting Board of Governors.
United States Intelligence Community
The United States Intelligence Community (IC) is the federation of 18 U.S. federal intelligence organizations, including the CIA, NSA, and DIA, coordinated by the Office of the Director of National Intelligence since 2005 under the National Security Act of 1947.
United States International Trade Commission
The United States International Trade Commission (USITC) is an independent federal agency, created in 1916, that decides whether imports injure U.S. industries and publishes the Harmonized Tariff Schedule.
United States intervention in Nigeria
United States intervention in Nigeria involves military aid, security cooperation, and humanitarian assistance. Since 2000, the U.S. has provided over $2 billion in aid and conducted direct strikes.
United States invasion of Afghanistan
United States invasion of Afghanistan, October 7, 2001 launch of Operation Enduring Freedom: US airpower, Special Forces, CIA teams, and Northern Alliance militias overthrew the Taliban after 9/11, beginning a two-decade war ending with the 2021 withdrawal.
United States invasion of Grenada
The United States invasion of Grenada, Operation Urgent Fury (25 October 1983), saw US and six Caribbean forces oust Grenada's military council after Maurice Bishop's execution; the UN General Assembly condemned it 108-9 as a violation of international law.
United States invasion of Panama
Operation Just Cause, the US invasion of Panama launched 20 December 1989, deposed and captured General Manuel Noriega, installed Guillermo Endara's government, and drew UN and OAS condemnation while enabling Panama's democratic transition.
United States Invitational Young Physicists Tournament
The United States Invitational Young Physicists Tournament, or USIYPT, is an annual two-day physics research and debate competition for high school teams, first held in 2007.
United States involvement in regime change
United States involvement in regime change: use of covert action, coups, and military intervention to replace foreign governments, from Iran 1953 and Guatemala 1954 to Iraq 1998 and Afghanistan, with measured declines in democracy and income in target states.
United States involvement in regime change in Latin America
United States regime-change involvement in Latin America: Monroe Doctrine-era interventions, CIA-backed coups in Guatemala (1954), Brazil (1964), Chile (1973), Bolivia (1971), direct invasions of the Dominican Republic (1965), Grenada (1983), and Panama (1989), and measured income and democracy costs.
United States involvement in the Venezuelan oil industry
United States involvement in the Venezuelan oil industry spans a century, from Standard Oil's early Lake Maracaibo ventures through the 1976 nationalization and later sanctions.
United States Junior Chamber
United States Junior Chamber (Jaycees, JCI USA), civic and leadership organization founded 1915 in St. Louis by Henry Giessenbier, nationally organized 1920; renamed United States Jaycees 1965; Supreme Court ordered women's admission 1984.
United States labor law
United States labor law: federal and state rules governing workers, unions, and employers. Centered on the 1935 NLRA (Wagner Act, creating the NLRB) and 1938 FLSA (minimum wage, 40-hour week), plus OSHA, Title VII, and WARN Act.
United States license plate designs and serial formats
License plate designs and serial formats in the United States vary by state. New York first registered automobiles in 1901, and standard plate size was fixed at 12 by 6 inches in 1956.
United States Lighthouse Service
The United States Lighthouse Service, formally the Bureau of Lighthouses, was the federal agency maintaining America's lighthouses and aids to navigation from 1789 to 1939.
United States Lines
United States Lines was a succession of American ocean-shipping companies from 1921 that became the largest American liner operator before collapsing in bankruptcy in 1986.
United States magistrate judge
United States magistrate judge: federal judicial officer of U.S. district courts, created 1968, renamed 1990. Appointed by district judges to renewable 8-year terms; handles pretrial matters, misdemeanors, and consent civil trials; not an Article III judge.
United States Marine Band
The United States Marine Band, known as "The President's Own," is the band of the US Marine Corps, established by Congress in 1798 to provide music for the President.
United States Marine Corps
United States Marine Corps (USMC), founded as the Continental Marines 10 November 1775 and re-established 11 July 1798; the U.S. naval expeditionary force organized as MAGTFs, now modernizing under Force Design.
United States Marine Corps Aviation
United States Marine Corps Aviation, also known as USMC aviation, is the air arm of the United States Marine Corps, founded in 1912 and dedicated to supporting Marine ground forces.
United States Marine Corps Force Reconnaissance
USMC Force Reconnaissance companies (FORECON): one per Marine expeditionary force, four-man deep recon teams observing and reporting enemy, weather, and terrain intelligence, with MEU platoon detachments and airborne/diver insertion skills.
United States Marine Corps rank insignia
United States Marine Corps rank insignia: chevrons, bars, oak leaves, and stars showing Marine pay grades E-1 to O-10, including Lance Corporal, Gunnery Sergeant, Marine Gunner, and the 2025 general officer star change.
United States Marine Corps Recruit Training
USMC Recruit Training, or boot camp, is the 13-week enlisted entry program at Parris Island and San Diego depots, run in four phases with nine functional areas and ending in the 54-hour Crucible, followed by the School of Infantry.
United States Marine Corps Reserve
The United States Marine Corps Reserve (USMCR), also Marine Forces Reserve (MARFORRES), is the Marine Corps' federal reserve component, established 29 August 1916; Ready Reserve of Selected Reserve (SMCR, IMA, AR) and IRR, with authorized end strength of 32,500.
United States Marine Corps Scout Sniper
The United States Marine Corps Scout Sniper, MOS 0317, was a Marine trained in long-range precision fire and reconnaissance from concealed positions until its 2023 disestablishment.