The United States bombed over 60 major Japanese cities during World War II, primarily through a massive, sustained incendiary campaign in 1945, in addition to the two atomic bombings. While the nuclear attacks on Hiroshima and Nagasaki are most famous, conventional firebombing devastated most of Japan's urban industrial areas.
Key details:
Firebombing Campaign: By August 1945, about 60 major cities had been burned down. Another source indicates 67 cities were specifically targeted for firebombing, often destroying massive percentages of the urban areas.
Major Targets: Major cities firebombed included Tokyo, Nagoya, Kobe, Osaka, Yokohama, and Kawasaki.
The Firebombing of Tokyo: The March 9-10, 1945, raid on Tokyo alone killed over 100,000 people, comparable to the atomic bombing death tolls.
Atomic Bombings: Two atomic bombs were dropped on Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945).
Total Destruction: The US Strategic Bombing Survey reported that 60 major Japanese cities were burned down