Following world war ii, how did the world’s leaders promote peace and reduce poverty?

Good Morning!
 
World War II was a shock to the world. After the sequence of blood shed in the first half of the century, the ideal was now to preserve some peace. The division of the world into two poles, however, ensured the continuation of regional conflicts: Korea, Vietnam, for example. US and USSR financed these conflicts. Peace, however, would have to be guaranteed by the newly created UN, by international alliances and by the financial assistance of the powers to rebuild the destroyed countries.