Shintoism drove Japanese into serious competition in warfare meaning Japan copied the West in arms development for their expansion dreams outside of Japan which WW II ended militarily but Japan recovered quickly by switching to economic warfare, a war which they won until serious economic competition from China developed. Buddhism didn't drive Japan's striving for economic superiority. Enlightenment never meant economic success as Gautama's example of deliberately forgoing wealth exemplified for Buddhists.
Shintoism didn't do that; all Shintoism is is praying to various shrines to the forces of nature. Buddhism didn't do that; that's a path to non-suffering. It was the political leader Tojo who caused Japan to invade other countries. Once again, it's all about politics, not spirituality. The Emperor had virtually no say in the matter.
Once again, you demonstrate that you don't know much about Buddhism. Not everyone in Japan is a Buddhist, and not everyone who is a Buddhist is enlightened.