The treaty that ended World War I and reshaped national boundaries in Europe is the Treaty of Versailles. Signed in 1919, it imposed significant reparations and territorial losses on Germany, aiming to prevent future conflicts. The treaty also established the League of Nations, intended to promote international cooperation and peace. However, its harsh terms fostered resentment in Germany, contributing to political instability and the rise of extremist movements. The redrawing of borders and creation of new states further complicated European politics, laying the groundwork for tensions that would lead to World War II.