President Franklin D. Roosevelt referred to December 7, 1941, as "a date which will live in infamy" because it was the day of the surprise attack on Pearl Harbor by the Japanese Imperial Navy. This attack led to significant loss of life and damage to the U.S. Pacific Fleet and ultimately prompted the United States to enter World War II, declaring war on Japan the following day, December 8, 1941. Roosevelt's speech aimed to highlight the treachery of the attack and rally the American public and Congress to support the war effort.
President Franklin D Roosevelt referred to December 7,1941,as "a date which will live in infamy " because on that day
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