Occupation of Japan
Reverse Course Japan was occupied and administered by the Allies of World War II from the surrender of the Empire of Japan on September 2, 1945, at the war's end until the Treaty of San Francisco took effect on April 28, 1952. The occupation, led by the American military with support from the British Commonwealth and under the supervision of the Far Eastern Commission, involved a total of nearly one million Allied soldiers. The occupation was overseen by the US General Douglas MacArthur, who was appointed Supreme Commander for the Allied Powers by the US President Harry S. Truman; MacArthur was succeeded as supreme commander by General Matthew Ridgway in 1951. Unlike in the occupations of Germany and Austria, the Soviet Union had little to no influence in Japan, declining to participate because it did not want to place Soviet troops under MacArthur's direct command. This foreign presence marks the only time in the history of Japan that it has been occupied by a foreign power. However, unlike in Germany, the Allies never assumed direct control over Japan's civil administration. In the immediate aftermath of Japan's military surrender, the country's government continued to formally operate under the provisions of the Meiji Constitution. Furthermore, at General MacArthur's insistence, Emperor Hirohito remained on the imperial throne and was effectively granted full immunity from prosecution for war crimes after he agreed to replace the wartime cabinet with a ministry acceptable to the Allies and committed to implementing the terms of the Potsdam Declaration, which among other things called for the country to become a parliamentary democracy. Under MacArthur's guidance, the Japanese government introduced sweeping social reforms and implemented economic reforms that recalled American "New Deal" priorities of the 1930s under President Franklin D. Roosevelt. In 1947, a sweeping amendment to the Meiji Constitution was passed that effectively repealed it in its entirety and replaced it with a new, American-written constitution, and the Emperor's theoretically vast powers, which for many centuries had been constrained only by conventions that had evolved over time, became strictly limited by law as a constitutional monarchy. While Article 9 of the constitution explicitly forbade Japan from maintaining a military or pursuing war as a means to settle international disputes, this policy soon became problematic especially as neighboring China fell under the control of the Chinese Communist Party and the Korean War broke out. As a result, the National Police Reserve (NPR) was founded in 1950. The NPR was reorganized into the Japan Self-Defense Forces (JSDF) in 1954, effectively completing the de facto remilitarization of Japan. The occupation officially ended with the coming into force of the Treaty of San Francisco, signed on September 8, 1951, and effective from April 28, 1952, after which the US military ceased any direct involvement in the country's civil administration thus effectively restoring full sovereignty to Japan with the exception of the Ryukyu Islands. The simultaneous implementation of the US-Japan Security Treaty allowed tens of thousands of American soldiers to remain based in Japan indefinitely, albeit at the invitation of the Japanese government and not as an occupation force. The occupation of Japan can be usefully divided into three phases: the initial effort to punish and reform Japan; the so-called "Reverse Course" in which the focus shifted to suppressing dissent and reviving the Japanese economy to support the US in the Cold War as a country of the Western Bloc; and the final establishment of a formal peace treaty with the 48 Allies of the Second World War and an enduring military alliance with the United States.
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