<P> There were numerous historical precedents for unannounced military action by Japan , but the lack of any formal warning , particularly while negotiations were still apparently ongoing , led President Franklin D. Roosevelt to proclaim December 7 , 1941 , `` a date which will live in infamy '' . Because the attack happened without a declaration of war and without explicit warning , the attack on Pearl Harbor was later judged in the Tokyo Trials to be a war crime . </P>
<P> There were numerous historical precedents for unannounced military action by Japan , but the lack of any formal warning , particularly while negotiations were still apparently ongoing , led President Franklin D. Roosevelt to proclaim December 7 , 1941 , `` a date which will live in infamy '' . Because the attack happened without a declaration of war and without explicit warning , the attack on Pearl Harbor was later judged in the Tokyo Trials to be a war crime . </P>
who was the president of the united states when pearl harbor was attacked
who was the president of the united states when pearl harbor was attacked
President Franklin D. Roosevelt
President Franklin D. Roosevelt