Hirohito was the longest reigning Japanese monarch, ruling from 1926 to 1989. During his reign, militaristic Japan entered World War II and bombed Pearl Harbor. After the US dropped atomic bombs on Hiroshima and Nagasaki in August 1945, Hirohito pushed for surrender. He then broke the precedent of imperial silence by making a national radio broadcast to announce Japan's surrender. After World War II, Hirohito changed the importance of the monarchy when he renounced what? Discuss (http://forum.thefreedictionary.com/postst50837_Hirohito-Becomes-Emperor-of-Japan--1926-.aspx)