A more thorough explanation:

The League of Nations was an international organization formed in 1919 with the goal of promoting cooperation and peace among nations. Its creation was endorsed by President Woodrow Wilson in a speech to Congress, but the United States never became a member.

The League of Nations was made up of member countries who agreed to work together to prevent future wars and resolve conflicts peacefully. It also aimed to improve living conditions and promote economic growth around the world.

Despite its efforts, the League of Nations was unable to prevent the outbreak of World War II and dissolved in 1946. Its assets were transferred to the United Nations, which was established in 1945 with a similar mission of promoting international cooperation and peace.

One example of the League of Nations' work was its efforts to resolve the conflict between Greece and Bulgaria in 1925. The League helped negotiate a peaceful settlement between the two countries, which prevented a potential war.

Another example was the League's work to improve public health around the world. It established the Health Organization, which worked to combat diseases and improve sanitation in member countries.