Scientists developed the atomic bomb in secrecy, and it was dropped on Hiroshima and Nagasaki after the Allies called for Japan's unconditional surrender. On 15 August 1945, the Emperor announced that his government had capitulated.
From 1945 until 1952, Japan was occupied by Allied troops under the command of U.S. General Douglas MacArthur. The early postwar years were a time of massive rebuilding. Millions of people were homeless, and millions more were repatriated from the former colonies. The economy was shattered, and mass starvation was a threat. Disillusionment with the cultural and social frameworks of prewar and wartime life was widespread.
The Occupation launched social and cultural reforms, including a democratic constitution and political system, universal adult suffrage, the emperor's renunciation of divinity and separation of religion from state control, agricultural land reform, the dismantling of major economic and industrial combines, the expansion of education, language reform, and expanded civil liberties.
By the mid-1950s, the initial reconstruction of society and economy had largely been accomplished, and the government had built a conservative consensus that the national priorities were economic growth and social stability, which would be achieved through the close cooperation of business and a government directed by bureaucratic elites. After the late 1950s, this "developmental state" created the social, economic, and political contexts in which ordinary people could experience middle-class urban lifestyles.
The characteristics of