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First World War: Map of Europe in 1914, showing the pre-war alliances
First World War: Map of Europe at the outbreak of war, showing the initial combatants.
First World War: October 1914, Turkey joins the Central Powers.
First World War: May 1915, Italy joins the allies
First World War: October 1915: Bulgarian joins the Central Powers
First World War: August 1916, Romania joins the allies.
First World War: June 1917, Greece joins the allies.
First World War: December 1917, Russia surrenders.
