Word War II Pencil Drawing

The war ended with the total victory of the Allies over Germany and Japan in 1945. World War II left the political alignment and social structure of the world significantly altered. While the United Nations was established to foster international cooperation and prevent future conflicts (such as World War III), the Soviet Union and the United States emerged as rival superpowers, setting the stage for the Cold War, which would last for the next 46 years. Meanwhile, the influence of European great powers started to decline—while the decolonization of Asia and of Africa began. Most countries whose industries had been badly damaged began moving toward economic recovery and across the world political integration emerged in an effort to peacefully stabilise after war relations.
The start of the war is generally held to be 1 September 1939 beginning with the German invasion of Poland; Britain and France declared war on Germany two days later. Other dates for the beginning of war include the Japanese invasion of Manchuria on 13 September 1931; the start of the Second Sino-Japanese War on 7 July 1937; or one of several other events.
Others follow A. J. P. Taylor, who held that there was a simultaneous Sino-Japanese War in East Asia, and a Second European War in Europe and her colonies. The two wars merged in 1941, becoming a single global conflict, at which point the war continued until 1945. This description uses the conventional dating.