Which of the following best describes the united states' role in world war ii? a. the united states played a key role in the military defeat of nazi germany. b. the united states' late entry into the war meant that very few american lives were lost. c. the united states declared war on nazi germany but refused to ally with the soviet union. d. the united states was a neutral power that did not support either side.

Question: Which of the following best describes the United States' role in World War II?  

Options:

A. The United States played a key role in the military defeat of Nazi Germany.  

B. The United States' late entry into the war meant that very few American lives were lost.  

C. The United States declared war on Nazi Germany but refused to ally with the Soviet Union.  

D. The United States was a neutral power that did not support either side.

The correct answer is option: A. The United States played a key role in the military defeat of Nazi Germany.

Explanation: Roosevelt, was the U.S. Commander-in-Chief, this means that he commanded nearly 90% of America's military resources towards the defeat of Hitler. The might of the world's largest industrial nation was turned against Nazi Germany due to Hitler declaring war on America. This was his biggest political mistake of the war because he had reduced the odds of Nazi Germany's survival. As a result, now he had to contend with three principal opponents: America, Britain and Russia. These 3 combined, created a great manpower and their total war production capacity dwarfed Nazi Germany.