
On July 28, 1914, Austria-Hungary declared war on Serbia, marking the beginning of World War I. This declaration was made one month after Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife were assassinated by a Serbian nationalist. In response to the assassination, Austria-Hungary, encouraged by its ally Germany, presented Serbia with an ultimatum, demanding the suppression of anti-Austrian propaganda and the right to conduct an investigation into the archduke's killing. Serbia accepted all demands except the latter, which would compromise its sovereignty, and Austria-Hungary subsequently broke off diplomatic relations and declared war. This act stirred up old tensions and anxieties across Europe, drawing in supporters and allies on both sides and ultimately leading to a global conflict.
| Characteristics | Values |
|---|---|
| Date | 28 July 1914 |
| Reason | Austria-Hungary wanted to punish Serbia for the assassination of Archduke Franz Ferdinand and his wife, Sophie, by a Serbian-backed terrorist |
| Support | Germany encouraged Austria-Hungary to declare war on Serbia and promised its support |
| Ultimatum | Austria-Hungary presented Serbia with a list of demands, including the suppression of anti-Austrian propaganda and the allowance of Austrian officials in the investigation of the assassination |
| Serbian Response | Serbia accepted all demands except one, which Austria-Hungary used as an excuse to declare war |
| Outcome | The declaration of war sparked a series of diplomatic and military escalations among European powers, leading to World War I |
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What You'll Learn

Austria-Hungary's determination to crush Serbian nationalism
Firstly, the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife, Sophie, on June 28, 1914, by a Serbian-backed terrorist was a significant catalyst. The assassin, Gavrilo Princip, was a Bosnian-Serb and a member of a Serbian-backed secret paramilitary organization. This event heightened tensions that had already been rising due to Austria-Hungary's annexation of Bosnia-Herzegovina in 1908 and Serbian ambitions to unify southeast Europe's Slavic people.
Secondly, Austria-Hungary viewed Serbian nationalism as a threat to the stability of its multi-ethnic empire. The Balkan Wars of 1912-1913 had made Serbia a larger and more assertive presence in the region, increasing tensions between the two nations. Austria-Hungary suspected Serbian backing for the assassination and became determined to use the incident to crush the perceived Serbian threat once and for all.
Additionally, Austria-Hungary's determination was influenced by the encouragement of its powerful ally, Germany. Germany supported the idea of an Austro-Hungarian attack on Serbia as a way to initiate a general war while they were in a position of strength. Kaiser Wilhelm II declared his support for "settling accounts with Serbia" and assured Austria-Hungary of Germany's unconditional backing. This encouragement played a significant role in Austria-Hungary's decision to declare war.
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Serbian ambitions to unify southeast Europe's Slavic people
Serbia, officially the Republic of Serbia, is a landlocked country in Southeast and Central Europe. Located in the Balkans, it has a long and complex history, with several regional states founded in the early Middle Ages. Serbia has faced various migrations over the centuries, including Slavic migrations in the 6th century.
The idea of a unified Serbian state was formulated in 1844 in a secret political draft created by Ilija Garašanin, a conservative statesman. This draft envisioned a Serbian state that included neighbouring areas such as Montenegro, Northern Albania, and parts of Bosnia and Herzegovina. In the early 20th century, most political parties in the Kingdom of Serbia embraced the idea of creating a Balkan Federation, with the ultimate goal of uniting all Serbs into a single Serbian state within the federation.
The Greater Serbia concept evolved into the Yugoslav Pan-Slavic movement by 1914, seeking to gain the support of other Slavs occupied by Austria-Hungary. The Niš declaration by Serbian Prime Minister Nikola Pašić in 1914 expressed the intention to integrate all territories containing Serbs and southern Slavs (except Bulgarians) into a "Yugoslav" state. This included regions such as Croatia, Slovenia, Bosnia, and Herzegovina. After World War I, Serbia achieved many of its nationalist aspirations by unifying the South Slavic regions of Austria-Hungary and Montenegro.
Serbia's ambitions to unify Southeast Europe's Slavic people were seen as a threat to Austria-Hungary's multi-ethnic empire, particularly after the Balkan Wars of 1912-1913, which increased Serbia's presence in the region. Austria's annexation of Bosnia in 1908 further strained relations between the two countries. The assassination of Archduke Franz Ferdinand by a Serbian-backed terrorist in June 1914 provided the catalyst for Austria-Hungary to take decisive action against Serbia, leading to the declaration of war on July 28, 1914, and the subsequent outbreak of World War I.
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The assassination of Archduke Franz Ferdinand
Archduke Franz Ferdinand was an advocate of increased federalism and was believed to favor trialism, which proposed reorganizing the Austro-Hungarian empire by combining the Slavic lands within it into a third crown. This potential reform was seen as a threat by Serb irredentists, who wanted to unify all South Slavic people in Southeast Europe. The political objective of the assassination was to establish an independent South Slav state, free from Austria-Hungarian rule.
The assassin, 19-year-old Gavrilo Princip, was a Bosnian Serb and part of a group of six Bosnian assassins, most of whom were Bosnian Serbs and members of a student revolutionary group called Young Bosnia. Young Bosnia was a local revolutionary movement that sought national liberation and social revolution. The group was influenced by a secret society called the Black Hand, based in Belgrade, which aimed to create a Greater Serbia through "terrorist action." The Black Hand had decided to assassinate Franz Ferdinand due to his perceived threat to Serbian independence.
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Germany's encouragement of Austria-Hungary
Secondly, Germany had formed a strong alliance with Austria-Hungary in 1879, which Italy joined later. This alliance provided Germany with strategic depth in Central Europe and a counterweight to the Franco-Russian alliance. Germany saw Austria-Hungary as a crucial ally and was determined to support it in times of conflict. When Austria-Hungary decided to take a hard-line approach towards Serbia after the assassination of Archduke Franz Ferdinand, Germany fully endorsed this decision.
Additionally, Germany played a role in shaping Austria-Hungary's ultimatum to Serbia, which was presented on July 23, 1914. The ultimatum included demands such as suppressing anti-Austrian propaganda and allowing Austria-Hungary to conduct its own investigation into the assassination. Germany urged Austria-Hungary to act quickly and decisively, hoping to localize the conflict and prevent Russian intervention. The German government advised Vienna to reject attempts at mediation and encouraged quick action against Serbia.
The encouragement of Austria-Hungary by Germany was also influenced by the complex web of alliances and rivalries in Europe. Germany feared 'encirclement' by the Triple Entente powers—France, Russia, and, to a lesser extent, Britain. By supporting Austria-Hungary's aggressive stance, Germany aimed to strengthen its own position and deter potential adversaries. However, this encouragement ultimately contributed to the outbreak of World War I, as the conflict quickly escalated beyond the Balkans, drawing in major European powers.
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Austria-Hungary's rejection of Serbia's reply to the ultimatum
On June 28, 1914, Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, and his wife were assassinated by a Serbian-backed terrorist in Sarajevo, Bosnia. This assassination was the catalyst for a series of events that led to Austria-Hungary declaring war on Serbia on July 28, 1914, marking the start of World War I.
In the aftermath of the assassination, Austria-Hungary, with encouragement and support from Germany, decided to pursue a hard-line policy towards Serbia. On July 23, 1914, nearly a month after the assassination, Austria-Hungary presented Serbia with an ultimatum, demanding, among other things:
- The suppression of all anti-Austrian propaganda within Serbia
- That Austria-Hungary be allowed to conduct its own inquiry into the assassination of the Archduke
Serbia's response to the ultimatum, delivered on the afternoon of July 25, accepted all the terms except for the involvement of Austro-Hungarian officials in the inquiry. Serbia's concession was not enough to satisfy Austria-Hungary, which rejected the reply and broke off diplomatic relations on July 25, choosing to continue with military preparedness measures.
Austria-Hungary's rejection of Serbia's reply was influenced by several factors. Firstly, they suspected Serbian backing for the assassination and were determined to crush the perceived Serbian threat to the stability of their multi-ethnic empire. Secondly, they had the guarantee of support from their powerful ally, Germany, which encouraged them to take a hard-line approach. Additionally, Serbia's partial acceptance of the ultimatum would have still destroyed its sovereignty, so a rejection was the only option that preserved Serbia's independence. Finally, the rejection and subsequent declaration of war were influenced by the volatile geopolitical context of the time, characterised by growing nationalism, increased militarism, imperial rivalry, and competition for power and influence in the Balkans region.
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Frequently asked questions
Austria-Hungary declared war on Serbia on July 28, 1914, exactly a month after the assassination of Archduke Franz Ferdinand and his wife, Sophie, by a Serbian-backed terrorist. The assassinations escalated the already-high tensions between the two nations and Austria-Hungary, encouraged by its ally Germany, used this opportunity to assert its dominance and crush the Serbian threat.
Germany played a significant role in influencing Austria-Hungary's decision to declare war on Serbia. Germany encouraged Austria-Hungary to take swift and decisive action against Serbia, assuring them of its unconditional support. Germany saw this as an opportunity to start a general war, and its military leaders believed that a conflict between Austria-Hungary and Serbia would be a localized affair.
The declaration of war by Austria-Hungary effectively triggered the First World War. Within a few days, several European countries became involved, with Russia, France, and Britain being drawn into the conflict. This led to a global war that lasted four years and resulted in widespread destruction and loss of life.
Relations between Austria-Hungary and Serbia had been strained for several years due to Serbia's ambitions to unify southeast Europe's Slavic people and Austria's annexation of Bosnia and Herzegovina in 1908. The assassination of Archduke Franz Ferdinand by a Serbian-backed terrorist further escalated these tensions, leading to the outbreak of war between the two nations.































