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Germany, the Soviet Union, and Slovak nations invaded Poland, one week after the Molotov-Ribbentrop Pact.
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The time from Nazi invasion of Poland to the atomic bombs in Japan.
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Britain and France, along with a few Commonwealth countries, declared war on Germany, in response to Germany invading Poland.
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Germany invaded France, Luxembourg, the Netherlands, and Belgium. The Netherlands and Belgium were overrun in a few weeks.
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The British were discontented in the Norwegian Campaign, which lead to the Prime Minster Neville Chamberlaine being replaced. He was succeeded by Winston Churchill.
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This was a surprise attack on a US Navy base. It was meant as a preventive strike to keep America from interfering with the war efforts. The Imperial Japanese Navy sent fighters, bombers, and torpedo planes to destroy the base. This attack would be a major factor in the American joining the war.
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America utilized the atomic bomb on the Japanses cities of Hiroshima and Nagasaki. Thousands of people were killed in this attack, but it was seen as an end to the war. It is debated whether or not there was a necessity to use nuclear force to eradicate this country country, however one point brought up is that the alternative for nuking would have been land invasion, where millions of people would have died, instead of the actual thousands.