Why did president roosevelt call the attack on pearl harbor a day of infamy

President Franklin Roosevelt called the unprovoked attack on Pearl Harbor a “date which will live in infamy,” in a famous address to the nation delivered after Japan’s deadly strike against U.S. naval and military forces in Hawaii. He also asked Congress to declare war.

well the fact it is basically a peninsula allowed trade to come from many places, thus allowing cultural diffusion to take place. india has seasonal monsoons that merchants travel back and forth from india using the monsoons wind patterns