The Japanese bombed Pearl Harbor in the year 1941. The exact date was December 7th, 1941 and the United States declared war almost immediately after.
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Japanese bomb naval base at Pearl Harbor, Hawaii on 07 Dec 1941
On December 24, 1941, Wake Island was conquered by Japanese forces. On December 25, 1941, Hong Kong surrendered to the Japanese.
United States
To convince the Japanese to surrender
There were no warnings. The Manhattan Project was a secret. This was the name of the research project that developed the atom bomb.