Final answer:
Harry Truman led the United States to victory in the final months of the war.
Step-by-step explanation:
The leader who led the United States to victory in the final months of World War II was Harry Truman. After the unexpected death of President Franklin Roosevelt, Truman assumed the presidency and made the difficult decision to drop atomic bombs on the Japanese cities of Hiroshima and Nagasaki. This forced Japan to surrender and brought an end to the war, securing victory for the United States and its allies.
Learn more about Leaders of the United States during World War II