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| United States military history | |
|---|---|
| Name | United States military history |
| Start | 1607 |
| Major conflicts | American Revolutionary War, War of 1812, Mexican–American War, American Civil War, Spanish–American War, World War I, World War II, Korean War, Vietnam War, Gulf War, War in Afghanistan (2001–2021), Iraq War |
| Notable personnel | George Washington, Ulysses S. Grant, Robert E. Lee, Abraham Lincoln, Theodore Roosevelt, Dwight D. Eisenhower, Douglas MacArthur, Chester W. Nimitz, Harry S. Truman, John F. Kennedy |
| Branches | United States Army, United States Navy, United States Marine Corps, United States Air Force, United States Space Force |
| Symbols | Stars and Stripes, Bald eagle (United States) |
United States military history covers the armed forces' development from early colonial militias to contemporary expeditionary campaigns, tracing continuity across personnel, institutions, and technology. It spans colonial conflicts and independence struggles, continental expansion and civil war, global industrialized warfare in two world wars, Cold War confrontations in Korea and Vietnam, and post–Cold War interventions and counterinsurgency campaigns. Influential leaders, landmark battles, doctrinal shifts, and social transformations shaped Constitution of the United States–era institutions and modern force structures.
Colonial-era encounters include Jamestown, Virginia settlements, conflicts with Powhatan Confederacy, and expeditions by Pilgrims into New England, with colonial militias patterned after English Civil War practices and European standing forces like British Army garrisons. Imperial rivalries produced the French and Indian War and campaigns such as the Siege of Fort William Henry and Battle of the Monongahela, influencing officers like George Washington and officers trained in colonial theaters. Revolutionary-era operations culminated in the Battles of Lexington and Concord, the Siege of Boston, the Battle of Saratoga, and the Siege of Yorktown, where cooperation among Continental forces, militia, and allied fleets such as the French Navy under Comte de Rochambeau proved decisive. Diplomatic instruments including the Treaty of Paris (1783) codified independence and altered transatlantic power balances.
The Early Republic saw creation of the United States Army and evolution of the United States Navy under leaders like Alexander Hamilton and John Paul Jones precedents informing responses to domestic crises such as the Whiskey Rebellion and external threats like the Barbary Wars where commodores like Stephen Decatur gained prominence. Expansionist campaigns included the War of 1812 with actions at the Battle of New Orleans and sieges of Fort McHenry, the Mexican–American War with the Battle of Chapultepec, and frontier conflicts against Indigenous nations including the Tecumseh–era wars and Indian Removal operations. The American Civil War between Union and Confederate States of America produced pivotal engagements at Gettysburg, Antietam, and Appomattox Court House, reshaping Abraham Lincoln’s leadership, mobilization, and technologies such as rifled muskets and ironclads like USS Monitor and CSS Virginia.
The turn of the century featured the Spanish–American War and interventions in Philippine–American War, expanding overseas reach and establishing bases influenced by strategists like Alfred Thayer Mahan. World War I mobilization saw the American Expeditionary Forces under John J. Pershing fight in offensives including the Meuse-Argonne Offensive, while interwar debates over isolationism and preparedness influenced legislation such as the National Defense Act of 1920. World War II transformed capabilities across theaters: Pacific campaigns including Pearl Harbor, Battle of Midway, Guadalcanal, and Iwo Jima involved Chester W. Nimitz, Douglas MacArthur, and Admiral Halsey; European operations encompassed Operation Torch, D-Day landings (Normandy), the Battle of the Bulge, and the Yalta Conference diplomacy involving Franklin D. Roosevelt and Winston Churchill. Strategic innovations included strategic bombing by Eighth Air Force and nuclear weapons employment at Hiroshima and Nagasaki under Manhattan Project auspices, prompting the United Nations founding conference.
Postwar demobilization gave way to Cold War commitments articulated in the Truman Doctrine and Marshall Plan, and institutions like North Atlantic Treaty Organization coordinated collective defense. The Korean War featured large-scale conventional combat at Pusan Perimeter and the Battle of Chosin Reservoir with commanders such as Douglas MacArthur and political decisions by Harry S. Truman. The Vietnam War involved counterinsurgency, aerial campaigns like Operation Rolling Thunder, and ground operations by United States Marine Corps and Army of the Republic of Vietnam alongside pacification programs, provoking domestic debates symbolized by Kent State shootings and policies of Lyndon B. Johnson and Richard Nixon. Cold War crises encompassed Berlin Airlift, Cuban Missile Crisis, and proxy conflicts in Angola and Afghanistan (1979–1989), while arms control yielded treaties like the Strategic Arms Limitation Talks.
Post–1991 operations ranged from humanitarian and peacekeeping interventions in Somalia and Bosnia and Herzegovina to high-intensity combat in the Gulf War with Operation Desert Storm and liberation of Kuwait under Norman Schwarzkopf. The September 11 attacks precipitated the War in Afghanistan (2001–2021) led by United States Central Command and the Iraq War with Operation Iraqi Freedom, toppling regimes like Saddam Hussein and conducting stabilization and counterinsurgency operations including Surge (2007). Counterterrorism efforts involved special operations units such as United States Special Operations Command and drone campaigns, while recent focus on great-power competition engages People's Republic of China and Russian Federation contingencies and alliances like Quadrilateral Security Dialogue and AUKUS.
Institutional evolution produced the Department of Defense and Goldwater–Nichols reforms shaping joint operations and headquarters such as United States Central Command and United States European Command. Doctrine progressed from continental defense to power projection through concepts like AirLand Battle, Shock and Awe, and hybrid warfare responses. Technological revolutions included ironclads and railways in the American Civil War, carrier aviation epitomized by USS Enterprise (CV-6), nuclear deterrence, precision-guided munitions, satellite reconnaissance via National Reconnaissance Office, and emergent domains with United States Space Force, cyber commands, unmanned aerial vehicles, and hypersonic research.
Military service influenced civil rights movements through figures like Buffalo Soldiers and integration policies under Executive Order 9981, while veterans' benefits evolved with laws such as the G.I. Bill. The armed forces affected demographic shifts via migration to Fort Bragg and urban centers, fostered institutions including United Service Organizations and Veterans Affairs, and shaped popular culture through films like Saving Private Ryan and literature by Ernest Hemingway and Tim O'Brien. Debates over civil–military relations involve constitutional framers like James Madison and contemporary discussions about congressional oversight, military professionalism, and the role of the Reserve Officers' Training Corps in civic life.