For hundreds of years Japan was at war
The evil emperor wanted to conquer the world.
Hell bent on accomplishing his goal, he couldn't get warriors fast enough.
He made it law, that every woman in Japan be pregnant at all times. Any woman who was not pregnant would be raped.
Emperor would be proud of this achievement, but he is dead. Much thanks America for defeating the evil emperor, and removing the curse on the people of Japan, for restoring Honor, and dignity.
It was not without cost to the USA.
Evil cannot be destroyed, only transferred.
America stood up to the bully emperor, and took his power, but that curse of evil is now on America.