The event in 1919 that signaled the end of World War I was the signing of the Treaty of Versailles on June 28. This treaty formally concluded the war between Germany and the Allied Powers and imposed strict reparations and territorial losses on Germany. The treaty aimed to prevent future conflict in Europe but also sowed the seeds for political and economic instability in Germany, setting the stage for World War II. The harsh terms prompted significant dissent and resentment among Germans, demonstrating the far-reaching consequences of the treaty and its enduring impact on 20th-century geopolitics.