The first of the European nations to declare war on another at the start of World War I was ______________.

Name: The first of the European nations to declare war on another at the start of World War I was ______________.
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Austria declared war on Serbia on July 28, 1914, marking the first declaration of war between European nations at the start of World War I. This was in response to the assassination of Archduke Franz Ferdinand of Austria.

The First of the European Nations to Declare War on Another