After World War II, Japan underwent significant changes as it rebuilt its economy and society. The country faced devastation from the war, including the atomic bombings of Hiroshima and Nagasaki. With the help of the United States through the Marshall Plan, Japan implemented reforms that modernized its industries and infrastructure, leading to rapid economic growth in the following decades. During this period, Japan adopted a new constitution in 1947, which emphasized democracy and human rights. The Japanese Diet became the national legislature, and the country renounced war through Article 9. These changes laid the foundation for Japan to emerge as a major global economic power by the 1960s.