That's a hard question to anser but the first world we don't know but all i can say is it ended at the world
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The League of Nations was formed at the end of World War One, the United Nations was formed at the end of World War II.
World war one ended with the treaty of Versailles. The allied and axis powers got together to create a document that would end world war one. but, they ended up blaming germany for everything, and allthough germany disagreed, it was passed anyway.
Treaty of Versailles - End of World War One
Franklin d. roosevelt
a baby boom that increased the US population