What important agreement was signed in 1919 to officially end World War I?

The agreement that was signed in 1919 to officially end World War I is known as the Treaty of Versailles. This treaty was pivotal as it laid out the terms for peace and the reorganization of countries in Europe following the war. It was signed on June 28, 1919, and included not only the cessation of hostilities but also significant punitive measures against Germany, including territorial losses, limitations on the military, and reparations for the damages caused by the war.

This treaty marked a significant shift in international relations and set the stage for various political developments in the years to follow. The Treaty of Versailles not only aimed to bring about peace but also to prevent the possibility of another large-scale conflict through the establishment of the League of Nations, which sought to foster diplomatic solutions and collective security.

In contrast, other options such as the Treaty of Ghent, which ended the War of 1812, did not pertain to World War I. The Paris Peace Treaty, while it sounds relevant, is a more general term and does not specifically refer to the agreement most commonly recognized for ending WWI. Lastly, the Munich Agreement was related to the pre-World War II context and thus is not relevant in the context of World War I.