Germany was important to World War II because it was the primary aggressor, initiating the war by invading Poland in 1939. The German military, led by Adolf Hitler and the Nazi Party, quickly conquered much of Europe, including France and the Low Countries. Germany's defeat in the war marked the end of Nazi rule and the reshaping of political boundaries in Europe.

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Germany played a significant role in World War II as it was the main instigator of the conflict, starting by invading Poland in 1939. Led by Adolf Hitler and the Nazi Party, the German military swiftly gained control over a large part of Europe, including France and the Low Countries. The defeat of Germany in the war resulted in the downfall of the Nazi regime and significant changes to the political map of Europe.