At the end of World War II, huge swaths of Europe and Asia had been reduced to ruins, borders were being redrawn, homecomings, expulsions, and burials were under way, and the massive efforts to rebuild had just begun. When the war began in the late 1930s, the world's population was approximately 2 billion. In less than a decade, the war between the nations of the Axis Powers and the Allies resulted in some 80 million deaths -- killing off about 4 percent of the whole world. Allied forces became occupiers, taking control of Germany, Japan, and much of the territory they had formerly ruled. Efforts were made to permanently dismantle their war-making abilities, as factories were destroyed and former leadership was removed or prosecuted. War Crimes trials took place in Europe and Asia, leading to many executions and prison sentences. Millions of Germans and Japanese were forcibly expelled from territory they formerly called home. Allied occupation and United Nations decisions led to many long-lasting problems in the future, including tensions that led to the creation of East and West Germany, divergent plans on the Korean Peninsula which led to the creation of North and South Korea -- and the Korean War in 1950, and the United Nations Partition Plan for Palestine which paved the way for Israel to declare its independence in 1948 and begin the continuing Arab-Israeli conflict. The growing tensions between Western powers and the Soviet Eastern Bloc developed into the Cold War, and development and proliferation of nuclear weapons raised the very real specter of an unimaginable World War III if common ground could not be found. World War II was the biggest story of the 20th Century, and its aftermath continues to affect the world profoundly more than 65 years later.
http://www.theatlantic.com/infocus/2011/10/world-war-ii-after-the-war/100180/