The United Nations (UN) succeeded the League of Nations. The League of Nations was an international organization founded after World War I with the goal of promoting peace and preventing future wars. The League of Nations was formed in 1920, but it was ultimately unsuccessful in preventing the outbreak of World War II, which began in 1939.
Following World War II, the United Nations was established in 1945 with a similar goal of promoting peace and international cooperation. Unlike the League of Nations, the UN was given more power and authority to enforce its decisions and promote peace and security around the world.
Today, the United Nations is a global organization with 193 member states, and it is involved in a wide range of activities, from peacekeeping and conflict resolution to promoting sustainable development and protecting human rights.