每天一篇“今日美史”，提炼和总结历史在今天发生的重要事件：谁，在哪里，什么时候，做了什么，这件事为什么重要，以及在写关于什么主题的论文的时候可以作为潜在的论据引用。
每天30秒，轻松积累史实，为AP美国历史拿5分打下坚实基础。
12/8 the U.S. declared war on Japan
When: Dec 8, 1941
Where: the U.S.
Who：Japan，the U.S.
What：the U.S. declared war on Japan
Why significant：After the Pearl Harbor attack by Imperial Japan on Dec 7, 1941, which killed 2400 people, Americans were stunned, shocked, and angered across the nation. All previous domestic opposition to U.S. entry into the war ceased.
Japan’s allies, Germany and Italy, declared war on the U.S. on December 11. The U.S. responded in kind, and therefore entered World War II. The U.S. was now immersed in a war it would conduct simultaneously in Europe and the Pacific, and it rapidly mobilized for the war.
Tags：World War II, Pearl Harbor, Roosevelt, U.S. embargo on oil export to Japan, American isolationism
Think about this: Do you think the U.S. would have entered World War II if the Japanese had not bombed Pearl Harbor? Why or why not?
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