July 28, 1914 through November 11, 1918
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World War 1 - known at the time as The Great War.
America actually joined in to help it's allies. The United States of America joined with Britain, France and Russia to to fight in World War I.
1939-1945. U.S. involvement was from the time of the attack on Pearl Harbor, December 7, 1941 until the end of the war in 1945.
World War I (known at the time as the Great War) started in 1914 and ended in 1918.
World War I happened at the same time worldwide. Afghanistan was not involved in that war, however.