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when did the first world war began​

Answer 1

Jul 28, 1914

Step-by-step explanation:

In 1914, Austria-Hungary, a country in south central Europe, was in control of that that another country, Serbia believed it owned. On June 28, 1914, a Serbian Nationalist assassinated Archduke Franz Ferdinand, the heir to the Austria-Hungarian throne. Austria-Hungary declared war on Serbia.