6 yrs.
It began on September 1, 1939 and ended on September 2, 1945.
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The U.S. Congress last exercised its power to declare war between December, 1941 and June, 1942 during the advent of America's involvement is World War II. It has not been used since, which means that all U.S. military action since then has been unconstitutional.
WW2 lasted from September 1939 to August 1945. All seasons were included in many, many parts of the world.
Many people will dispute this question but in my OPINION I think that it is world war 1 where the United States stopped its Isolationism policy.
James Monroe was the fifth President of the US. He was considered the last of the Revolutionary War generation because he was the last president who was a founding father of the United States.