Which countries did the United States fight against in World War II?

The United States fought against Japan, Germany, and Italy during World War II, which aligns with the historical context of the conflict. Japan was involved in the Pacific theater, initiating hostilities through the attack on Pearl Harbor in 1941. Germany and Italy were part of the Axis powers, collaborating in various military operations across Europe and North Africa. The United States joined the Allies in opposition to these countries, partnering with nations like the United Kingdom and the Soviet Union to defeat the Axis powers. This collaboration ultimately led to significant military engagements and the eventual surrender of each of these nations in 1945, marking the conclusion of World War II.

Other options include countries that were either neutral or part of the Allied Powers during the war. France and Britain were allies of the United States against Germany and Italy, Spain remained neutral, and China fought against Japan but was not an adversary of the U.S. in a military sense during the war. Understanding this context helps clarify why the focus is specifically on Japan, Germany, and Italy regarding the U.S. involvement in World War II.