The USA intervened in the second world war because:

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The Italy attack on Pearl Harbor

The Russian attack on Pearl Harbor

The Japanese attack on Pearl Harbor

All of these

answer is C.

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Detailed Solution

The USA intervened in the second world war because the Japanese attacked on the Pearl Harbor.
The dispute over American involvement in both the Pacific as well as European theaters of World War II was put to rest by the Japanese attack on Pearl Harbor particularly on December 7, 1941. With just one vote against it, Congress waged war on Imperial Japan the day following the attack.As it didn't want to deal with another financial downturn after the war, the USA avoided going into the conflict. However, it was unable to avoid the battle for very long. In the east, Japan was gaining power. In addition to plotting attacks on US naval ports in the Pacific, it conquered French Indo-China. In a nutshell, the act of aggression by Japan on Pearl Harbor on December 7, 1941, prompted the United States to join World War ll.

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