How Did World War I End?
World War I (1914–18; first called the Great War) came to an end when the balance of power shifted in favor of the Allies (Serbia, France, Great Britain, Italy, Russia, the United States, and nineteen other nations) against the Central Powers (Austria-Hungary, Germany, Bulgaria, and the Ottoman Empire). Although the United States had not been fully prepared to enter the war, the American government mobilized quickly to rally troops and citizens behind the war effort. In April 1917 the U.S. Army numbered slightly more than 100,000 men. By the end of the war, however, the number had soared to about 5,000,000. The arrival of U.S. troops in Europe gave the Allies the manpower they needed to win the war. In November 1918 Germany agreed to an armistice (truce), and the Central Powers finally surrendered. In January 1919, Allied representatives gathered in Paris, France, to draft the peace settlement. By the time the combat ended, almost 10,000,000 people were dead.
Further Information: First World War. [Online] Available http://www.spartacus.schoolnet.co.uk/FWWtitle.html, October 25, 2000; Martin, Gilbert. The First World War: A Complete History. New York: Henry Holt, 1994; World War I. [Online] Available http://cfcsc.dnd.ca/links/milthist/wwi.html, October 25, 2000.
The Treaty of Versailles ended WWI on June 28 1919, it was supposed to be an agreement to stop fighting but we see it doesn't actually stop the fighting completely when WWII comes around.