
Following Japan's surrender at the end of World War II, the country was occupied by the Allies, with U.S. General Douglas MacArthur, the Supreme Commander for the Allied Powers, directing Prime Minister Kijūrō Shidehara to draft a new constitution. This document, also known as the MacArthur Constitution or Peace Constitution, was written in 1946 and adopted in 1947. It introduced three foundational principles to post-war Japan: popular sovereignty, respect for human rights (including equal rights for women), and the renunciation of war. The constitution has guided Japan's democratic development and set the country on a path to economic prosperity.
| Characteristics | Values |
|---|---|
| Year written | 1946 |
| Year adopted | 1947 |
| Length | 5,000 signs |
| Authors | U.S. General Douglas MacArthur, a committee of Japanese scholars |
| Purpose | To prevent Japan from going to war again, to rebuild Japan, to punish Japan for past militarism and expansion |
| Governmental blueprint | Parliamentary system, three branches of government: legislative, executive, and judicial |
| Notable articles | Article 9, the peace clause |
| Article 9, the peace clause | "The Japanese people forever renounce war as a sovereign right of the nation and the threat or use of force as a means of settling international disputes. In order to accomplish the aim of the preceding paragraph, land, sea, and air forces, as well as other war potential, will never be maintained." |
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What You'll Learn

US-Japan Relations
The US-led occupation of Japan began in 1945, following Japan's surrender at the end of World War II. The US, alongside other Allied nations, sought to punish Japan for its past militarism and expansionism, as well as to prevent the country from remilitarizing in the future. This involved dismantling the Japanese Army, banning former military officers from political leadership, and introducing land reforms to reduce the power of wealthy landowners who had supported Japanese expansionism. The US also sought to democratize Japan, identifying the Meiji Constitution of 1887 as a flawed document that had enabled militarists to take control.
General MacArthur directed the writing of Japan's new constitution, known as the "MacArthur Constitution" or "Peace Constitution", which was drafted in 1946 and adopted in 1947. The document introduced three foundational principles to post-war Japan: popular sovereignty, respect for human rights (including equal rights for women), and the renunciation of war. Article 9 of the constitution, known as the peace clause, states that "the Japanese people forever renounce war as a sovereign right of the nation and the threat or use of force as a means of settling international disputes."
The US-Japan relationship evolved over time, with the US eventually encouraging Japan to rearm and form a military alliance during the Cold War. However, Japan initially resisted rearmament due to the devastation of the war and the principles of its new constitution. The interpretation and potential amendment of Article 9 have been a constant source of debate in Japan, especially as the country's economic and military power grew, and as new global security challenges emerged. Despite these debates, Japan's constitution has not been amended since its inception.
In conclusion, the drafting of Japan's postwar constitution under US supervision represents a unique aspect of US-Japan relations. The constitution has guided Japan's democratic development and set the country on a path to economic prosperity, while also serving as a symbol of the strong and enduring ties between the two nations.
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The Potsdam Declaration
The declaration was drafted during the Potsdam Conference, a series of wartime conferences attended by the Allied leaders: U.S. President Harry S. Truman, UK Prime Minister Winston Churchill, and Chinese President Chiang Kai-shek. Notably, the Soviet Union, which was not yet at war with Japan, did not endorse the ultimatum at Potsdam.
> "We do not intend that the Japanese shall be enslaved as a race or destroyed as a nation, but stern justice shall be meted out to all war criminals, including those who have visited cruelties upon our prisoners... Freedom of speech, of religion, and of thought, as well as respect for the fundamental human rights shall be established."
The Japanese government initially rejected the Potsdam Declaration but later accepted it after the atomic bombings of Hiroshima and Nagasaki and the Soviet Union's invasion of Japanese territory. The declaration served as a framework for the occupation and rehabilitation of Japan, led by U.S. General Douglas MacArthur, who supervised the drafting of a new constitution for the country.
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The Meiji Constitution
During the Allied occupation of Japan following World War II, the Meiji Constitution was replaced by the "Postwar Constitution" or the "Post-war Constitution", which took effect on May 3, 1947. The Meiji Constitution was seen as a flawed document that had enabled militarists to take control and lead Japan into war, and thus it was replaced by a new constitution based on Western-style liberal democracy. The new constitution established popular sovereignty, respect for human rights, and the renunciation of war as fundamental principles.
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The Role of Emperor Hirohito
Emperor Hirohito was the longest-reigning monarch in Japan's history, serving as emperor from 1926 until his death in 1989. During World War II, he was the emperor of Japan and, in this role, he was revered by the Japanese populace as a divine figure.
After the Japanese surrender in August 1945, there was pressure from the Allies and Japanese leftists for Hirohito to be tried as a war criminal. However, the Americans were concerned that removing him from power and subjecting him to trial could trigger civil unrest in Japan. General Douglas MacArthur believed that a cooperative emperor would facilitate a peaceful occupation and help achieve other U.S. postwar objectives. MacArthur thus excluded any evidence that could have incriminated Hirohito and his family from the Tokyo War Crimes Tribunal.
In 1946, Hirohito was pressured by the Allies to renounce his divinity and, under Japan's new constitution drafted by U.S. officials, his role as emperor was redefined in 1947 as the "symbol of the State and of the unity of the people". Japan became a constitutional monarchy, with sovereignty residing in the people rather than the emperor, whose powers were severely curtailed. To bring the imperial family closer to the people, Hirohito made numerous public appearances and allowed the publication of pictures and stories of his personal and family life, increasing his popularity and helping to preserve the Japanese imperial system.
There is historical debate about the role Hirohito played in Japan's militaristic period and expansionist policies. Historians such as Herbert Bix argue that Hirohito was not merely a figurehead, but actively participated in making political and military decisions. Other historians point to evidence that Hirohito had a chance to end the war earlier but did not, maintaining hope for a negotiated peace.
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Article 9: The Peace Clause
Japan's constitution, also known as the "MacArthur Constitution", the "Post-war Constitution", or the "Peace Constitution", was drafted under the supervision of U.S. General Douglas MacArthur, the Supreme Commander for the Allied Powers, following Japan's surrender in World War II. Prime Minister Kijūrō Shidehara created a committee of Japanese scholars to draft the constitution, but MacArthur later presented his own draft, which was reviewed and modified by the scholars before its adoption.
Article 9 of the constitution, also known as the "Peace Clause", is a unique aspect of Japan's constitution, attracting the most attention and sparking much debate. This clause is a formal renunciation of war, stating that:
> "The Japanese people forever renounce war as a sovereign right of the nation and the threat or use of force as a means of settling international disputes. In order to accomplish the aim of the preceding paragraph, land, sea and air forces, as well as other war potential, will never be maintained."
The wording of Article 9 makes a distinction between military forces, which can threaten or use force to resolve international disputes, and self-defence forces, which can deal with aggression against Japan itself. This interpretation allowed Japan to assemble formidable self-defence forces during the Cold War, while still renouncing war as a means of dealing with international differences.
The necessity and practicality of Article 9 have been debated in Japan since its enactment, particularly following the establishment of the Japan Self-Defence Forces (JSDF) in 1954. The JSDF is a de facto post-war Japanese military force, and its creation has led to discussions about the constitutionality of Japan's military. Some argue that the JSDF is not a land, sea, or air force, but an extension of the national police force, falling within a loophole in the wording of the Peace Clause. Others, particularly pacifists, believe that the JSDF is unconstitutional and that Japan should be detached from international wars.
The changing geopolitical situation, especially escalating tensions in East Asia, has brought the debate over Article 9 to the forefront in recent years. Some argue that the constitution is outdated and needs amendment to address new security challenges, such as UN peacekeeping operations and combined operations with the United States. On the other hand, many Japanese citizens continue to strongly support Article 9, valuing its role in maintaining peace and prosperity in the Asia-Pacific region.
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Frequently asked questions
The postwar Japanese constitution was written under the supervision of U.S. General Douglas MacArthur, the Supreme Commander for the Allied Powers.
Yes, Prime Minister Kijūrō Shidehara created a committee of Japanese scholars to draft a new constitution. The draft created under MacArthur's supervision was reviewed and modified by these scholars before its adoption.
The US led the Allies in the occupation and rehabilitation of Japan after World War II. The US occupying forces, led by MacArthur, enacted widespread military, political, economic, and social reforms.
The constitution introduced three foundational principles: popular sovereignty, respect for human rights (including equal rights for women), and the renunciation of war.
Article 9, also known as the peace clause, states that "the Japanese people forever renounce war as a sovereign right of the nation and the threat or use of force as a means of settling international disputes".

























