Effects of World War II on Japan World War II drastically affected the Japanese culture, economics, and Japan is considered one of the most important and powerful countries in the modern world but this accomplishment has been reached by a lot of work and changes made in the Japanese society. During World War II the destruction of Japanese cities and the death of a lot of Japanese people caused them to change their in their system of politics and foreign policy. The changes made in Japan were not only in the politics but also in the culture in general because of the entrance of western ideas into Japan after World War II made the Japanese adapt their