Which treaty formally ended World War I?

The Treaty of Versailles is recognized as the formal agreement that ended World War I, signed on June 28, 1919. This treaty was significant in shaping the post-war landscape, imposing heavy reparations and territorial losses on Germany, which played a crucial role in historical events that followed. The treaty also established the League of Nations, aiming to promote peace and prevent future conflicts, though it ultimately faced challenges and did not prevent World War II.

Other treaties mentioned, such as the Paris Peace Treaty, were related but not the main agreement that concluded the war. The Treaty of Trianon and the Treaty of Saint-Germain specifically dealt with Hungary and Austria, respectively, and were part of the wider series of agreements that emerged from the peace negotiations after World War I but did not serve as the main treaty that formally ended the overall conflict. Thus, the Treaty of Versailles stands out as the key document in formally concluding this global war.