Answer:Allied powers and central powers
Explanation:The Central powers were Austria-Hungary, Germany, Bulgaria and the Ottoman Empire. And the Allied powers were Serbia, Russia, France, the United Kingdom, Italy, Belgium and the United States.
It ended on the 11th of November 1918. Difference in policies were to blame, although the immediate cause of World War one was the assassination of Austria's Archduke Franz Ferdinand. The war started mainly because of four aspects: Militarism, Alliances, Imperialism and Nationalism
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