Pearl Harbor US Naval base, was bombed by ___ thus provoking formal entry of the US in the Second World War:
Q1. Pearl Harbor US Naval base, was bombed by ___ thus provoking formal entry of the US in the Second World War:
Answer: Japan
Explanation: Japan's surprise attack on the US naval base at Pearl Harbor, Hawaii, on December 7, 1941 prompted the United States to formally declare war the following day, entering World War II.