Answer:
After the fall of the Mariana Islands during World War II, the Japanese government became increasingly concerned about the possibility of air raids on their homeland. As a result, they took a number of steps to prepare their cities for such attacks:
1. Blackout drills: The Japanese government implemented blackout drills, during which all lights in the city were turned off to make it more difficult for enemy planes to locate their targets.
2. Air raid shelters: The government constructed air raid shelters in cities, including underground shelters and shelters built into hillsides.
3. Evacuation plans: The government developed plans for the evacuation of civilians from major cities to less populated areas in the event of an air raid.
4. Propaganda campaigns: The government launched propaganda campaigns to encourage civilians to participate in air raid drills and to be prepared for air raids.
5. Civil defense organizations: The government established civil defense organizations to coordinate emergency response efforts in the event of an air raid.
Despite these efforts, many Japanese cities suffered devastating damage from air raids by Allied forces, including the bombings of Hiroshima and Nagasaki.