<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 us president when pearl harbor was bombed
who was the us president when pearl harbor was bombed
Franklin D. Roosevelt
Franklin D. Roosevelt