The significant international agreement aimed at promoting peace after World War II was the United Nations Charter, established in 1945. The UN was created to foster international cooperation and prevent future conflicts by providing a platform for dialogue among nations. It aimed to address global issues such as human rights, economic development, and social progress. The charter set forth the principles of sovereign equality of all member states, the peaceful resolution of disputes, and the promotion of social and economic stability. The establishment of the UN marked a collective effort by nations to ensure a more peaceful global community.