https://en.wikipedia.org/wiki/World_War_I
World War I or the First World War, often abbreviated as WWI or WW1, began on 28 July 1914 and ended on 11 November 1918. Referred to by contemporaries as the " Great War ", its belligerents included much of Europe , the Russian Empire , the United States , and the Ottoman Empire , with fighting also expanding into the Middle East , Africa ...