Following world war 2, how did the world's leaders promote peace and reduce poverty?

Folowing World War II, The world's leaders promoted peace and reduced poverty by starting and participating in the United Nations. United Nations promoted cooperation between nations, instead of aggression. It is an intergovernmental organization created to keep international peace and security, develop friendly relations among nations, achieve international co-operation and be a centre for harmonizing the actions of nations.

The correct answer is by starting and participating in the United Nations. The UN was the international peacekeeping organization formed directly after World War II was called off. The Soviet Union created a buffer zone between itself and the Western powers by taking over some western countries in Europe.