Final answer:
The United States entered World War II in the Pacific due to the bombing of Pearl Harbor by Japan, leading to a shift from isolationism to active participation.
Explanation:
The United States entered World War II in the Pacific primarily due to the bombing of Pearl Harbor by Japan on December 7, 1941. This surprise attack led to the U.S. declaring war on Japan and ultimately entering the global conflict.
Before the attack, tensions had been escalating between the U.S. and Japan due to the U.S. embargo on Japan in response to Japan's aggressive expansion in Southeast Asia and the Pacific region.
This event marked a significant turning point for the United States, shifting the country from a policy of isolationism to active involvement in World War II.
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