9. World War II (Against Bulgaria, 1942)
On June 5, 1942, the United States declared war on Bulgaria, following Bulgaria’s declaration of war on the U.S. on December 13, 1941. This action was part of the broader conflict involving the Axis powers, which included Germany, Italy, and Japan. The U.S. military responded by launching operations in the Mediterranean theater, aiming to weaken Axis control in North Africa and the Mediterranean. For the official declaration document, refer to the Senate’s records: (senate.gov).
