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War Powers and Declarations of War

War of 1812: Senate Amendments

The Constitution grants Congress the sole power to declare war. Since the first declaration of war against Great Britain in 1812, Congress has declared war on 10 other occasions, including the last formal declaration of war with Rumania in 1942. Since that time Congress has agreed to resolutions authorizing the use of military force and has continued to shape U.S. military policy through appropriations and oversight.