These photographs were taken in peacetime:
Naval History and Heritage Command is an excellent source for historical information about the attack on Pearl Harbor and all of the above photographs come from their site.
National Archives page with radiogram and original documents.
The United States and Japan were not at war with each other when Japan attacked our military installations on Sunday morning, Dec. 7, 1941. Our country had failed to understand the evil and underestimated the threat.
May we learn from our mistakes.