It is estimated that the Germans killed between 1.8 and 1.9 million non-Jewish Polish civilians during World War II. In addition, the Germans murdered at least 3 million Jewish citizens of Poland.
The Soviet Union encountered more than 4 million soldiers casualties. This led to the Russians having to move key factories away from the borders and created manufacturing problems. These tactics early on in the war caused for numerous casualties.
Hitler's invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany, marking the beginning of World War II.
The three main reason for the World War II was the Treaty of Versailles, the failure of peace efforts, and the rise of dictatorships.
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