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The United States has formally declared war in five separate conflicts, issuing declarations against ten different foreign nations. The only country to have been the subject of multiple U.S. war declarations is Germany, which the United States formally declared war against twice, once in World War I and again in World War II.
Additionally, some small states have unilaterally declared war on major world powers such as the United States or Russia when faced with a hostile invasion and/or occupation. The following is a list of declarations of war (or the existence of war) by one sovereign state against another since the end of World War II in 1945.
Five wars have been declared by Congress under their constitutional power to do so: the War of 1812, the Mexican–American War, the Spanish–American War, World War I, and World War II. [ 1 ] In a message to Congress on May 11, 1846, President James K. Polk announced that the Republic of Texas was about to become a state.
This is a list of military conflicts, that United States has been involved in. There are currently 123 military conflicts on this list, 5 of which are ongoing. These include major conflicts like the American Revolutionary War, the War of 1812, the Mexican–American War, the American Civil War, the Spanish-American War, World War I, World War II and the Gulf War.
On 11 December 1941, four days after the Japanese attack on Pearl Harbor and three days after the United States declaration of war against Imperial Japan, Nazi Germany declared war against the United States, in response to what was claimed to be a "series of provocations" by the United States government when the U.S. was still officially neutral during World War II.
President Roosevelt, wearing a black armband, signs the Declaration of War on Japan on December 8, 1941. On December 8, 1941, at 12:30 PM ET, the United States Congress declared war (Pub. L. 77–328, 55 Stat. 795) on the Empire of Japan in response to its surprise attack on Pearl Harbor and subsequent declaration of war the prior day.
On December 11, 1941, the United States Congress declared war on Germany (Pub. L. 77–331, Sess. 1, ch. 564, 55 Stat. 796), hours after Germany declared war on the United States after the attack on Pearl Harbor by the Empire of Japan. [1] The vote was approved unanimously by both houses of Congress; 88–0 in the Senate and 393–0 in the House.
An Act Declaring War between the United Kingdom of Great Britain and Ireland and the Dependencies Thereof and the United States of America and Their Territories was passed by the 12th United States Congress on June 18, 1812, thereby beginning the War of 1812. It was signed by James Madison, the 4th President of the United States.