Vietnam War--August, 1964 to January, 1973 = 101 months*
American Revolution--April, 1775 to September, 1783 = 100 months
Afghanistan-- October, 2001 to Present (as of March, 2008) = 77 months
Iraq War--March, 2003 to Present (as of March, 2008) = 60 months
U.S. Civil War--April, 1861 to April, 1865 = 48 months
World War II--December, 1941 to September, 1945 = 45 months
World War I--April, 1917 to November, 1918 = 19 months
Korean War-- June, 1950 to July, 1953 = 37 months
War of 1812--June, 1812 to February, 1815 = 32 months
U.S.-Mexican War-- May, 1846 to February, 1848 = 21 months
Spanish-American War--April, 1898 to August, 1898 = 5 months
Gulf War--January, 1991 to March, 1991 = 3 months
*Us involvement began in the late 1950's and lasted until 1975. I'm measuring from the introduction of ground troops to their withdrawal.
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