On September 2nd, 1945, the foreign affairs delegation of the Japanese Empire boarded the USS Missouri and signed the Japanese Instrument of Surrender under the guidance of Emperor Hirohito, finally putting an end to bloodiest war mankind has ever seen. From that moment on, the world and Japan could start to rebuild.
The bombings of Hiroshima and Nagasaki forced Japan into an unconditional surrender, accepting all terms stated by the Potsdam Declaration. Among other stipulations, the terms of surrender meant that Japan must give up all lands outside of the mainland unless allowed by the Allied Forces, disarm their military, remove all obstacles to building a democratic society, and eliminate, for all time, "the authority and influence of those who have deceived and misled the people of Japan into embarking on world conquest."
Despite those terms, it was Emperor Hirohito who vowed to maintain the peace — which was met with much disdain by many Americans and Japanese alike, with the exception of General Douglas MacArthur.
The International Military Tribunal for the Far East was set up and those responsible for the many war crimes committed were brought to justice. Prime Ministers Tojo, Hirota, Koiso, and twenty-three others were all found guilty of Class-A war crimes and sentenced to execution. Another 5,700 would be tried for Class-B and -C war crimes. Hirohito and the other members of the Japanese Imperial family were simply exonerated at the request of Gen. MacArthur.
Gen. MacArthur knew that Japanese culture was very intertwined with the throne. Since the Japanese throne was willing to cooperate fully, America was able to turn its eyes to the burgeoning communist threat lurking in Asia. This plan could only work, however, if the people of Japan believed the Emperor when he said that peace between the two nations had been achieved.
With the announcement of that newly struck peace came a photo that was taken by Gen. MacArthur's personal photographer, Lt. Gaetano Faillace that captured the General and the Emperor's first meeting on September 27th, 1945.
(U.S. Army Photo by Lt. Gaetano Faillace)
The Japanese press was reluctant to run the photo, but the Americans insisted. At this point in Japanese history, the people had just fought and died for the Emperor because they saw him as having incarnate divinity. Suddenly, some occupying force stepped in and showed the people a picture of their 5' 5" Emperor next to a 6-foot-tall American general.
General MacArthur knew the significance of the photo. The Japanese people knew the significance of the photo. And yet Emperor Hirohito gave his blessing for it to be published — affirming his commitment to bringing peace and rebuilding Japan at the expense of the height comparison.
As devastating as the nuclear bombs were, the firebombings of Tokyo and the rest of Japan were just as bad.
Calls for Hirohito's abdication were growing among the Imperial family. While most would call for Hirohito's son (and current Emperor), Akihito, to assume the throne when of age, other family members scrambled to make cases sit on the throne themselves. Their claim was that Hirohito was, in fact, not divine if he drove the Empire into the ground. Many of those claimants could have spelled ruin for MacArthur's rebuilding process as some harbored a strong hatred for America.
So, the Humanity Declaration was given on New Year's Day, 1946. In it, the Emperor stated in front of his entire people that the emperor was not divine and that the Japanese people were no more superior than any other people. MacArthur was pleased because it meant that Japan would move more towards more democratization.
The declaration, in essence, meant that Emperor Hirohito went from being a divine imperial sovereign to a regular constitutional monarch.
It humanized him and would allow him to stay as head of state well into the 80s.
Emperor Hirohito formalized the 1947 Constitution of Japan — officially an amendment to the Meiji Constitution — and stripped himself almost entirely of political control. In the following years, Hirohito's commitment to Japan led to restructuring and the entering of an era called the Japanese Economic Miracle. Japan became the world's second largest economy by the time of Hirohito's death on January 7th, 1989.