Final answer:
The country that did most of the fighting in WWII was Russia. They endured significant casualties and played a crucial role in the defeat of Nazi Germany.
Step-by-step explanation:
The country that did most of the fighting in WWII was Russia, also known as the Soviet Union at the time. They endured significant casualties and played a crucial role in the eventual defeat of Nazi Germany. The US, France, Britain, and other Allied nations also contributed greatly to the war effort, but it was the Soviet Union that bore the brunt of the fighting on the Eastern Front.
Learn more about The country that did most of the fighting in WWII