The Attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States (a neutral country at the time) against the naval base at <a href="/c/books/credit/570457/pearl-harbor/">Pearl Harbor</a> in Honolulu, Hawaii on Sunday morning, December 7, 1941.
The attack led to the United States' formal entry into <a href="/c/books/credit/169598/world-war-ii/">World War II</a> the next day. The Japanese military leadership referred to the attack as the Hawaii Operation and Operation AI, and as Operation Z during its planning.
