Exactly one month after the assassination of Archduke Franz Ferdinand, Austria-Hungary declared war on Serbia.
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The ultimatum was delivered at 6pm on 23 July by the Austro-Hungarian ambassador to Belgrade, with a deadline of 48 hours within which the Serbian government had to respond. The accepted all but one of the demands.
The assassination of Archduke Franz Ferdinand by Gavrilo Princip in 1914 had a direct effect on the outbreak of war, while the Treaty of Versailles was signed on exactly the same date five years later in 1919.
The Treaty of Trianon was signed between Hungary and most of the Allies of the First World War.
In a secret agreement signed on 26 April in London, Italy agreed to leave the Triple Alliance, join the forces of the Triple Entente, and declare war on Austria-Hungary and Germany.
Germany, Austria-Hungary and Italy formed the Triple Alliance.
On the 23rd July 1914, Austria-Hungary issued an ultimatum to Serbia specifically designed to be rejected and lead to war between the two countries.
The National Assembly of Romanians of Transylvania and Hungary declared the unification of Transylvania and the Kingdom of Romania.
The 28th June saw both the trigger and the definitive end of the First World War.
On the 23rd May 1915, Italy entered the First World War on the side of the Triple Entente and declared war on Austria-Hungary.
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