The United States' decision to enter World War II was primarily influenced by the attack on Pearl Harbor, shifting public sentiment towards active participation.
News reports and editorials in the days following the attack on Pearl Harbor would be the most important information for explaining the United States' decision to become involved in World War II. The attack on Pearl Harbor on December 7, 1941, was the event that directly led to the U.S. entry into the war, shifting public sentiment from isolationism to active participation.
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