American Wars timeline.

Period: Jan 1, 1800 to Jan 1, 1805

First Barbary Wars

United States vs. Morocco, Algiers, Tunis, and Tripoli
Jan 1, 1815

Second Barbary Wars

United States vs. Morocco, Algiers, Tunis, and Tripoli
Period: Apr 25, 1846 to Feb 2, 1848

Mexican-American War

United States vs. Mexico
Period: Apr 25, 1898 to Aug 12, 1898

Spanish-American War

United States vs. Spain
Period: Jul 28, 1914 to Nov 11, 1918

World War I

Triple Alliance: Germany, Italy, and Austria-Hungary vs. Triple Entente: Britain, France, and Russia. The United States joined on the side of the Triple Entente in 1917.
Period: Sep 1, 1939 to Sep 2, 1945

World War II

Axis Powers: Germany, Italy, Japan vs. Major Allied Powers: United States, Great Britain, France, and Russia
Period: Jun 25, 1950 to Jul 27, 1953

Korean War

United States (as part of the United Nations) and South Korea vs. North Korea and Communist China
Period: Dec 1, 1956 to Apr 30, 1975

Vietnam War

United States and South Vietnam vs. North Vietnam
Period: Aug 2, 1990 to Feb 28, 1991

Persian Gulf War

United States and Coalition Forces vs. Iraq
Period: Oct 7, 2001 to Mar 3, 2014

Invasion of Afghanistan

United States and Coalition Forces vs. the Taliban regime in Afghanistan to fight terrorism.
Period: Mar 20, 2003 to Dec 15, 2011

Invasion of Iraq

United States and Coalition Forces vs. Iraq

First Barbary Wars