Emperor Shōwa was Emperor of Japan from 25 December 1926 until his death in 1989. He reigned during a period of increasing Japanese nationalism and militarism, culminating in the entry of the Empire of Japan into World War II as an Axis power. The atomic bombing of Hiroshima and Nagasaki led Hirohito to announce the surrender of Japan to the Allies in August 1945. Under pressure from the Allies, he issued the Humanity Declaration in January 1946, rejecting the divinity of the emperor as a descendant of Amaterasu. The Constitution of Japan, adopted on November 1946, emphasizes pacifism and constitutional monarchy, in contrast to imperialism and absolute monarchy. After the war, he reigned over a period of unprecedented economic growth known as the Japanese economic miracle. Hirohito reigned for 62 years and 13 days, the longest reign in Japanese history and the 12th longest verifiable reign in world history.