What changed politically, socially, and economically for Japan during the war that took place between 1931 and 1945 (from the Manchurian Incident to

What changed politically, socially, and economically for Japan during the war that took place between 1931 and 1945 (from the Manchurian Incident to the Japanese surrender) and the American Occupation from 1945-1952? What were the post-1952 effects of what happened between 1931 and 1952?