Which event was a major political outcome of World War I's close?

The signing of the Treaty of Versailles is a pivotal political outcome of World War I, as it officially concluded the war and set the stage for the geopolitical landscape of the 20th century. This treaty was negotiated in 1919 and imposed significant territorial, military, and economic restrictions on Germany, holding it responsible for the war and demanding reparations. The treaty redrew the map of Europe, leading to the establishment of new nations and altering borders, which significantly affected the political dynamics in the region.

The implications of the Treaty of Versailles extended far beyond its immediate aftermath, contributing to the political instability in Germany that eventually led to World War II. It is also considered a critical moment in international relations, as it highlighted the need for a collective approach to prevent future conflicts, paving the way for ideas that later influenced the establishment of the League of Nations and the United Nations. However, the Treaty itself is specifically recognized for its role in ending World War I and shaping the post-war order.