there is none. the longest war in World War 1 is world war 1. it would have to be the longest battle. :)*
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It is important because it is the longest war in the world.
The longest war the United States ever entered was the Vietnam War.
Battle of the Atlantic
No, the United States did not fight in the eastern front in World War I (or even in World War II). The eastern front, in both World Wars, was mainly in Russia and was fought primarily by Russia. The U.S. did deploy troops to Russia during the Russian Civil War, right after World War I, but it was a short stay and the U.S. troops did not see much fighting. The longest war the U.S. has fought so far has been the war in Afghanistan, which, as of writing this in November 2015, is now just over 13 years old (while the U.S. officially ended its deployment there in late 2014, there are still U.S. troops fighting there). The longest declared war that the U.S. fought was the war against Japan during World War II- it started on December 7, 1941 and ended when Japan surrendered nearly four years later on September 2, 1945.