Aftermath of World War I
The fighting in World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 ended in western Europe when the Armistice took effect at 11:00 am GMT
Greenwich Mean Time
Greenwich Mean Time is a term originally referring to mean solar time at the Royal Observatory in Greenwich, London. It is arguably the same as Coordinated Universal Time and when this is viewed as a time zone the name Greenwich Mean Time is especially used by bodies connected with the United...

 on November 11, 1918, and in eastern Europe by the early 1920s. During and in the aftermath of the war the political, cultural, and social order was drastically changed in Europe, Asia and Africa, even outside the areas directly involved in the war. New countries were formed, old ones were abolished, international organizations were established, and many new and old ideologies took a firm hold in people's minds.
Throughout the period from the armistice on 11 November 1918 until the signing of the peace treaty with Germany on 28 June 1919, the Allies
Allies of World War I
The Entente Powers were the countries at war with the Central Powers during World War I. The members of the Triple Entente were the United Kingdom, France, and the Russian Empire; Italy entered the war on their side in 1915...

 maintained the naval blockade of Germany
Blockade of Germany
The Blockade of Germany, or the Blockade of Europe, occurred from 1914-1919 and was a prolonged naval operation conducted by the Allied Powers during and after World War I in an effort to restrict the maritime supply of raw materials and foodstuffs to the Central Powers, which included Germany,...

 that had begun during the war.