Major U.S. Wars
Throughout its history, the United States has been involved in numerous conflicts that have shaped its identity, values, and role on the global stage. Below is an overview of the most significant wars involving the United States.
American Revolutionary War (1775–1783)
The war for independence from Britain. It led to the creation of the United States and established key democratic principles. The conflict ended with the Treaty of Paris in 1783.
War of 1812 (1812–1815)
Fought against Britain over trade restrictions, impressment of American sailors, and territorial expansion. It solidified U.S. sovereignty and national pride, though territorial borders remained mostly unchanged.
Mexican-American War (1846–1848)
A conflict resulting in the U.S. acquisition of vast southwestern territories, including present-day California, Arizona, and New Mexico. The Treaty of Guadalupe Hidalgo ended the war.
American Civil War (1861–1865)
A devastating internal conflict between the Union (North) and Confederacy (South), primarily over slavery and states' rights. The Union’s victory preserved the nation and led to the abolition of slavery.
Spanish-American War (1898)
A short war against Spain that resulted in U.S. control over Puerto Rico, Guam, and the Philippines. It marked the beginning of the U.S. as an overseas colonial power.
World War I (1917–1918)
The U.S. joined the Allies late in the conflict, contributing to the defeat of the Central Powers. The war introduced the U.S. as a major global military force.
World War II (1941–1945)
After the attack on Pearl Harbor, the U.S. entered the war against the Axis powers. The Allied victory, led in part by U.S. military and industrial strength, reshaped global politics and ended with the U.S. as a superpower.
Korean War (1950–1953)
A United Nations-backed effort, led by the U.S., to repel North Korean invasion of South Korea. The war ended in a stalemate and armistice, with Korea remaining divided.
Vietnam War (1955–1975)
A controversial conflict aimed at stopping the spread of communism in Southeast Asia. The U.S. ultimately withdrew, and Vietnam was reunified under communist control.
Gulf War (1990–1991)
A U.S.-led coalition liberated Kuwait after Iraq’s invasion under Saddam Hussein. The war showcased advanced U.S. military technology and quick victory.
War in Afghanistan (2001–2021)
Launched in response to the 9/11 terrorist attacks to dismantle al-Qaeda and remove the Taliban. It became the longest U.S. war before ending in a full withdrawal.
Iraq War (2003–2011)
Initiated to eliminate weapons of mass destruction (which were never found) and topple Saddam Hussein. It led to years of conflict and instability in the region.