Were their any signs of the impending attack on Pearl Harbor prior to December 7 1941?
Hell yeah! The Navy were even ordered to move the fleet from California (way out of reach of the Japanese planes) to Hawaï to ensure the succes of the attack and force the US into war.
Answer Pearl Harbor is a military base the Japanese attacked in Hawaii. Pearl Harbor was located in the "US Territory of Hawaii." Hawaii and Alaska were NOT states back then. Answer The Japanese attack on Pearl Harbor on the morning of December 7, 1941. Pearl Harbor is a harbor on the island of Oahu, Hawaii.