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The significance of the Poland invasion was it ended the era of appeasement and prompted Britain and France to declare war on Nazi Germany. The parties involved in this attack on Poland were  Nazi Germany, the Slovak Republic, and the Soviet Union.

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the significance of the Atlantic battle was, the route by which all resources came to Britain, without the Atlantic the country would have failed. The parties involved were the German submarine force and surface units against the U.S. Navy, U.S. Coast Guard, Royal Navy, Royal Canadian Navy, and Allied merchant convoys.

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Germany Invades France, Belgium, and the Netherlands 

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Germany Invades France, Belgium, and the Netherlands 

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This was significant because they wanted to bypass the French defense line at the eastern border.

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France surrendered to the Nazis in 1940 for complex reasons. when they surrendered Germany divided France into two zones: one to be under German military occupation and one to be left under nominal French sovereignty.

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When Britain won, It demonstrated the courage and resilience of the country's military and allowed them to remain free from Nazi corruption. Which was exactly what Britain was fighting because Hitler wanted to control the land.

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This was significant because of the Selective Training and Service Act of 1940. This is important because Roosevelt wanted to strengthen the unprepared U.S. armed forces.

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This is significant because it publicly affirmed the sense of solidarity between the U.S. and Great Britain against Axis aggression. This is important because the meeting had been called in response to the geopolitical situation in Europe.

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This is important because Hitler had long considered Leningrad a key objective in the invasion.  This is significant because it resulted in the deaths of some one million of the city's civilians and Red Army defenders.

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This is important because Hitler hoped that the German counter-attack would surround the British and American armies and stall the Allied offensive against Germany. This is significant because it marked the last German offense on the Western Front.

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Japan surrendered because of the atomic bombings of Hiroshima and Nagasaki. This is significant because it effectively ended World War II.