World War I began in 1914 after the assassination of Archduke Franz Ferdinand of Austria-Hungary on June 28, 1914, in Sarajevo. He was killed by Gavrilo Princip, a Serbian nationalist. Austria-Hungary blamed Serbia and declared war on it. Because of a complex system of military alliances, other countries were quickly drawn into the conflict: Russia supported Serbia Germany supported Austria-Hungary France supported Russia Britain entered the war after Germany invaded Belgium As a result, a local conflict turned into a global war. In short, one assassination triggered a chain reaction that led to World War I
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