<P> Perceptions of treachery in the attack before a declaration of war sparked fears of sabotage or espionage by Japanese sympathizers residing in the U.S., including citizens of Japanese descent and was a factor in the subsequent Japanese internment in the western United States . Other factors included misrepresentations of intelligence information suggesting sabotage, notably by General John DeWitt, commanding general of Western Defense Command on the Pacific Coast, who had personal feelings against Japanese Americans . In February 1942, Roosevelt signed United States Executive Order 9066, requiring all Japanese Americans to submit themselves for internment . </P> <P> Propaganda made repeated use of the attack, because its effect was enormous and impossible to counter . "Remember Pearl Harbor!" became the watchwords of the war . </P> <P> The American government understated the damage inflicted, in hopes of preventing the Japanese from learning it, but the Japanese had, through surveillance, a good estimate . </P> <P> On December 8, 1941, Japan declared war on the United States and the British Empire . The Japanese document discussed world peace and the disruptive actions of the United States and the United Kingdom . The document claimed all avenues for averting war had been exhausted by the Government of Japan . </P>

What did japan do after the bombing of pearl harbor