World war 2 change the balance of power as the old Western and Central European players have given way to only two non-European players which include the United States and the Soviet Union.
World war 2 started from started on September 1939 with the invasion of Hitler in Poland due to the war declared on Germany by France and Great Britain.
The causes of world war 2 were the Treaty of Versailles, the rise of economic depression after world war 1, failure of the nations league, which all contributed to and give rise to the second world war.
After this war, the United States and the Soviet Union emerged as superpowers in the world as all powers got shifted due to huge destruction in world war 2.
Learn more about World war 2, here:
https://brainly.com/question/1039997
#SPJ1
