In 1914, the country that declared war against Serbia when the Serbs rejected the critical item in the former's ultimatum was:

Name: In 1914, the country that declared war against Serbia when the Serbs rejected the critical item in the former's ultimatum was:
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Austria (more precisely, Austria-Hungary) declared war on Serbia on July 28, 1914, after Serbia rejected the ultimatum following the assassination of Archduke Franz Ferdinand. This event is widely considered the spark that ignited World War I.

In 1914, the Country That Declared War Against Serbia When