- After WWII, Europe lay in ruins with 40 million dead and 50 million homeless. Cities were destroyed and Europe became divided between Western democratic nations and Eastern European communist nations controlled by the Soviet Union.
- The US and USSR emerged as superpowers, but were divided ideologically by the spread of communism. Decolonization led to independence for India, nations in Asia and Africa gained independence in the following decades.
- The UN was formed to promote international cooperation and prevent future wars. It has faced challenges in maintaining peace due to ideological divisions between member states.