Final answer:
The Soviet Union suffered the most deaths during World War II, with estimates of around twenty-seven million casualties.
Explanation:
The country that suffered the most deaths during World War II was the Soviet Union, with an estimated twenty-seven million victims, making it the nation with the highest casualties.
Germany lost over 5 million soldiers and up to 3 million civilians, while Poland lost six million, and Yugoslavia 1.7 million lives during the war.
The war resulted in approximately 55 - 60 million deaths worldwide, with the Soviet Union bearing a significant portion of the casualties.
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