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Austria-Hungary blamed serbia and declared war.Other nations jumped in. By early august world war I had begun. When it was over,the map of europe looked very different.empires had toppled. New countries had formed
The countries that fought in world war I split into two camps. Russia,France,Belgium, and the united kingdom were among the side of serbia. They were called the allies.Opposing them were the central powers: Germany, Austria-Hungary,The Ottoman Empire, and Bulgaria.
The United States largely in response to german submarine attacks on its ships joined the allies in april 1917. Most of the fighting took place on two fronts in europe but the war also spread to the middle