Length of U.S. official participation in major wars
|1.||Vietnam Conflict||1965/3 – 1975/05||(9 years, 10 months)||
|2.||War in Afghanistan||2001/10 – present ||20 years
|3.||War in North-West Pakistan||2004/03 – present||9.5 years
(9 years, 6 months)
|4.||Iraq War||2003/03 – 2011/12||8.7 years
(8 years, 9 months)
|5.||American Revolutionary War||1775/04 – 1783/09||8.4 years
(8 years, 5 months)
|6.||American Civil War||1861/04 – 1865/04||4 years||
|7.||World War II||1941/12 – 1945/08||3.7 years
(3 years, 8 months)
|8.||Korean Conflict||1950/06 – 1953/07||3.1 years
(3 years 1 month)
|9.||War of 1812||1812/06 – 1814/12||2.5 years
(2 years, 6 months)
|10.||Mexican-American War||1846/05 – 1848/02||1.8 years
(1 year, 10 months)
|11.||World War I||1917/04 – 1918/11||1.6 years
(1 year, 7 months)
|12.||Spanish-American War||1898/05 – 1898/12||0.7 years
|13.||Persian Gulf War||1990/08 – 02/1991||0.6 years
(Ongoing wars indicated in bold and with orange bars.) Source: Associated Press
- Article One, Section Eight of the Constitution gives the United States Congress the power to declare War". Historically wars have been either declared as "Formal" wars or authorized as "Authorized military engagements". In 1973 Congress further clarified their role in authorized armed conflict with the passing of the War Powers Resolution.
- The dates used by the Associated Press for official U.S. involvement in the Vietnam War are August 1964 (the Gulf of Tonkin Resolution) to January 1973 (the Paris Peace Accords), although U.S. military activities and intervention in Vietnam spanned from 1950 to 1975.
- For the Philippine–American War, not included by the Associated Press in their tally above, official start and end dates used by some sources are June 2, 1899 – July 4, 1902, (three years and one month,) although resistance groups continued fighting until June 15, 1913.
- The start date used by the Associated Press for U.S. engagement in the Persian Gulf War is January 17, 1991 (the start of its extensive aerial bombing campaign under the offensive known as Operation Desert Storm.) The first US Combat Troops arrived in South Vietnam in 1965.
- U.S. President Barack Obama pledged in 2009 and 2010 that the U.S. war in Iraq would end by the end of 2011 when all remaining U.S. troops would be withdrawn from Iraq. Then, in the Spring of 2011, Secretary of Defense Gates, went to Iraq, pleading with the government of Iraq, to let U.S. Forces remain past the 2011 deadline.
- American imperialism
- American foreign policy
- CIA sponsored regime change
- Department of Defense
- Declaration of war by the United States
- Military history of the United States
- Military–industrial complex
- Overseas expansion of the United States
- Overseas interventions of the United States
- Relative costs of American wars
- United States and state terrorism
- United States Armed Forces
- United States casualties of war
- War crimes committed by the United States
- US military deaths in Iraq war at 4,452 Wednesday, according to Associated Press count
- US military deaths in Iraq war at 4,452
- Dan Simpson Why can't we stop our wars?
- Robert Gates' Pentagon Legacy: Unfinished Wars, Unfinished Budget Reform
- Obama May Face Tough Decision as Iraqi Leader Signals U.S. Troops Could Stay
- Pentagon rethinks Iraq pull-out plans
- Iraq Withdrawal Date For U.S. Troops May Be Pushed Back Beyond 2011
- (33)The term “Persian Gulf War” means the period beginning on August 2, 1990, and ending on the date thereafter prescribed by Presidential proclamation or by law. http://www.law.cornell.edu/uscode/text/38/101
- U.S. Participation in Major Wars
- Herring, George C.: America's Longest War, p. 18.
- Zinn, A People's History of the United States, p. 471.
- Kolko, Gabriel Anatomy of War, pages 457, 461 ff., ISBN 1-898876-67-3
- Delmendo 2004, p. 47.
- Constantino 1975
- Agoncillo 1990, p. 247
- Iraq war is ending, with last troops out in 2011: Obama
- 1991: 'Mother of all Battles' begins
- Obama: Iraq war to end in 2011
- Obama tells veterans that end of Iraq war is about to begin
- Obama: 'The war is ending,' fulfilling campaign pledge
- Obama Declares an End to Combat Mission in Iraq
- US in Final Phase of Iraq War
- Obama envoy secretly offered troops in Iraq after 2011
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