Consequences_of_the_attack_on_Pearl_Harbor

⭐ Core Definition: Consequences of the attack on Pearl Harbor

Japan's attack on Pearl Harbor took place on December 7, 1941. The United States military suffered 19 ships damaged or sunk, and 2,403 people were killed. Its most significant consequence was the entrance of the United States into World War II. The US had previously been officially neutral and considered an isolationist country with its Neutrality Act but subsequently after the attack declared war on Japan the next day and entered the Pacific War. Then on December 11, 1941, four days after the Japanese attack, after the Italian declaration of war on the United States and the German declaration of war against the United States, which Hitler had orchestrated, the US was then at war with Germany and Italy. The US then became involved in the Battle of the Atlantic and the European theatre of war as well as with Japan.

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The Allies, formally referred to as the United Nations from 1942, were an international military coalition formed during World War II (1939–1945) to oppose the Axis powers. Its principal members were the "Big Four" – the United Kingdom, Soviet Union, United States, and China.

Membership in the Allies varied during the course of the war. When the conflict broke out on 1 September 1939, the Allied coalition consisted of the United Kingdom, France, and Poland, as well as their respective dependencies, such as British India. They were joined by the independent dominions of the British Commonwealth: Canada, Australia, New Zealand and South Africa. Consequently, the initial alliance resembled that of the First World War. As Axis forces began invading northern Europe and the Balkans, the Allies added the Netherlands, Belgium, Norway, Greece, and Yugoslavia. The Soviet Union, which initially had a nonaggression pact with Germany and participated in its invasion of Poland, joined the Allies after the German invasion of the Soviet Union in June 1941. The United States, while providing some material support to European Allies since September 1940, remained formally neutral until the Japanese attack on Pearl Harbor in December 1941, after which it declared war and officially joined the Allies. China had already been at war with Japan since 1937, and formally joined the Allies in December 1941.

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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. The vote was approved unanimously by both houses of Congress; 88–0 in the Senate and 393–0 in the House.

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