World War I also known as WWI, The Great War, The First World War, and the War to End All Wars.

This was a global war fought mainly in Europe from 28 June 1914 – 11 November 1918.

The fighting mainly took place along several fronts that broadly encircled the European continent, Africa and the Middle East and briefly in China and the Pacific Islands.

The war was fought between two major alliances. The Entente Powers initially consisted of France, the United Kingdom, Russia, and their associated empires and dependencies. Numerous other states joined these allies, most notably Japan in August 1914, Italy in April 1915, and the United States in April 1917.

The war was ended by several treaties, most notably the Treaty of Versailles, signed on 28 June 1919, though the Allied powers had an armistice with Germany in place since 11 November 1918. One of the most striking results of the war was a large redrawing of the map of Europe. All of the Central Powers lost territory, and several new nations were created.

After the war, the League of Nations was created as an international organization designed to avoid future wars by giving nations a means of solving their differences diplomatically. World War I ended the world order which had existed since the end of the Napoleonic Wars, and was an important factor in the outbreak of World War II.