On This Day - What happened 11 December 1941 AD

On December 11, 1941, Hitler and Mussolini declared war on the United States, which responded in kind.

On 11 December 1941, four days after the Japanese attack on Pearl Harbor and the United States declaration of war against the Japanese Empire, Germany declared war against the United States.

On December 11, 1941, the United States Congress declared war upon Germany, hours after Germany declared war on the United States after the attack on Pearl Harbor by the Empire of Japan.