The three major results of World War II that have affected the rest of the 20th century and our current 21st century include:
1. A new world order: The war led to the defeat of the Axis powers and the establishment of new international organizations such as the United Nations, which has played an important role in maintaining world peace and security.
2. The atomic bomb: The development and use of atomic bombs during the war led to an arms race between superpowers, with the threat of nuclear war looming over the world and greatly influencing international relations.
3. Vastly expanded governmental powers: The war led to vast expansion of government powers, particularly in terms of economic planning and control, resulting in the rise of welfare states and increased government involvement in people's lives.