The US president who proposed the League of Nations couldn't get America to join
Woodrow Wilson made a league of nations the last of his Fourteen Points in 1918 and won the 1919 Nobel Peace Prize for championing it. But the US Senate refused to ratify the Treaty of Versailles, which contained the League's covenant, so the United States never joined. Without it, the League struggled to stop aggression in the 1930s and was replaced by the United Nations in 1945.