The United States occupied Japan and replace it imperial government with Communist democracy. Thus option 3rd is correct.
Democracy refers to the system of the government in which the people chooses the representative of the state through voting and that person represents the state and works for the welfare of the nation.
The United nation acquired the Japan in 1945 after the end of the World war II and it brought the drastic changes in the Economy of the Japan. The Japan was disarmed and its government form was changed into democratic form of the government.
Therefore, it can be concluded that The imperial government of Japan was replaced with a communist democracy after American occupation.
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