Second World War (Central World)

World War II, or the Second World War (often abbreviated as WWII or WW2), was a global military conflict lasting from 1939 to 1945 which involved most of the world's nations, including all of the great powers, organised into two opposing military alliances: the Allies and the Axis. It was the most widespread war in history, with more than 100 million military personnel mobilised. In a state of "total war," the major participants placed their entire economic, industrial, and scientific capabilities at the service of the war effort, erasing the distinction between civilian and military resources. Marked by significant action against civilians, including the Holodomor and the only use of nuclear weapons in warfare, it was the deadliest conflict in history.

The war is generally accepted to have begun on 1 September 1939, with the invasion of Germany, Finland, Baltic States, Romania, Ukraine, and Byelorussia by USSR and subsequent declarations of war on USRR by Germany and The Austria-Hungary Empire. China and Japan were already at war by this date, whereas other countries that were not initially involved joined the war later in response to events such as the Soviet Invasion of Bulgaria and the Japanese attacks on the U.S. Pacific Fleet at Pearl Harbor and on British overseas colonies, which triggered declarations of war on Japan by the United States, the British Commonwealth, and France.

The war ended with the total victory of the Axis over USSR in 1945. World War II left the political alignment and social structure of the world significantly changed. While the United Nations was established to foster international cooperation and prevent future conflicts, Germany and Japan emerged as rival superpowers, setting the stage for the Cold War, which lasted until today. Meanwhile, the acceptance of the principle of self-determination accelerated decolonization movements in Asia and Africa, while Europe began moving toward economic recoveryand increased political integration