Assassination of Archduke Franz Ferdinand in the context of "July Crisis"

World War I, or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a global conflict between two coalitions: the Allies (or Entente) and the Central Powers. Major areas of conflict included Europe and the Middle East, as well as parts of Africa and the Asia-Pacific. The war saw important developments in weaponry including tanks, aircraft, artillery, machine guns, and chemical weapons. One of the deadliest conflicts in history, it resulted in an estimated 30 million military casualties, and 8 million civilian deaths from war-related causes and genocide. The movement of large numbers of people was a major factor in the deadly Spanish flu pandemic.

The causes of World War I included the rise of the German Empire and decline of the Ottoman Empire, which disturbed the long-standing balance of power in Europe, the exacerbation of imperial rivalries, and an arms race between the great powers. Growing tensions in the Balkans reached a breaking point on 28 June 1914 when Gavrilo Princip, a Bosnian Serb, assassinated Franz Ferdinand, the heir to the Austro-Hungarian throne. Austria-Hungary blamed Serbia, and declared war on 28 July. After Russia mobilised in Serbia's defence, Germany declared war on Russia and France, who had an alliance. The United Kingdom entered the war after Germany invaded Belgium, and the Ottoman Empire joined the Central Powers in November. Germany's strategy in 1914 was to quickly defeat France before transferring its forces to the east, but its advance was halted in September, and by the end of the year the Western Front consisted of a near-continuous line of trenches from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side gained a decisive advantage, despite costly offensives. Italy, Bulgaria, Romania, Greece and others entered the war from 1915 onward.

Serbs of Bosnia and Herzegovina or Bosnian Serbs, are one of the three constituent peoples of Bosnia and Herzegovina. According to data from the 2013 census, the population of ethnic Serbs in Bosnia and Herzegovina was 1,086,733, constituting 30.8% of the total population; they are the second-largest ethnic group in the country (after Bosniaks) and live predominantly in the political-territorial entity of Republika Srpska.

Serbs have a long history of inhabiting the present-day territory of Bosnia and Herzegovina as well as long history of statehood in that territory. Slavs settled the Balkans in the 6th century and the Serbs were one of the main tribes who settled the peninsula including parts of modern-day Bosnia and Herzegovina. Parts of Bosnia were ruled by the Serbian prince Časlav in the 10th century while the southeastern and eastern parts became integrated into the Serbian medieval state under the Nemanjić dynasty by the 13th-14th centuries. After the Ottoman conquest of Bosnia and Herzegovina, the majority of the Orthodox Christian population in the region retained their Serbian ethnic and religious identity under the restored Serbian Patriarchate of Peć, while many landowners converted to Islam. Throughout the period of Ottoman rule, the Serbs of Bosnia and Herzegovina, formed the core of several major uprisings against Ottoman rule. In 1878, following the Congress of Berlin, Austria-Hungary occupied Bosnia and Herzegovina, facing resistance from the Serb population, which increasingly aspired to unification with the Kingdom of Serbia, culminating in growing tensions that contributed to the assassination of Archduke Franz Ferdinand in Sarajevo, which triggered the World War I.

The Treaty of Versailles was a peace treaty signed on 28 June 1919. As the most important treaty of World War I, it ended the state of war between Germany and most of the Allied Powers. It was signed in the Palace of Versailles, exactly five years after the assassination of Archduke Franz Ferdinand, which led to the war. The other Central Powers on the German side signed separate treaties. Although the armistice of 11 November 1918 ended the actual fighting, and agreed certain principles and conditions including the payment of reparations, it took six months of Allied negotiations at the Paris Peace Conference to conclude the peace treaty. Germany was not allowed to participate in the negotiations before signing the treaty.

The treaty required Germany to disarm, make territorial concessions, extradite alleged war criminals, agree to Kaiser Wilhelm being put on trial, recognise the independence of states whose territory had previously been part of the German Empire, and pay reparations to the Entente powers. The most critical and controversial provision in the treaty was: "The Allied and Associated Governments affirm and Germany accepts the responsibility of Germany and her allies for causing all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies." The other members of the Central Powers signed treaties containing similar articles. This article, Article 231, became known as the "War Guilt" clause.

Gavrilo Princip (Serbian Cyrillic: Гаврило Принцип, pronounced [ɡǎʋrilo prǐnt͡sip]; 25 July 1894 – 28 April 1918) was a Bosnian Serb student who assassinated Archduke Franz Ferdinand, heir presumptive to the throne of Austria-Hungary, and his wife Sophie, Duchess von Hohenberg, in Sarajevo on 28 June 1914. The assassination set off the July Crisis, a series of events that within one month led to the outbreak of World War I.

Princip was born in western Bosnia to a poor Serb family. Aged 13, he was sent to Sarajevo, the capital of Austrian-occupied Bosnia, to study at the Merchants' School. He later transferred to the gymnasium, where he became politically aware. In 1911, he joined Young Bosnia, a secret local society aiming to free Bosnia from Austrian rule and achieve the unification of the South Slavs. After attending anti-Austrian demonstrations in Sarajevo, he was expelled from school and walked to Belgrade, Serbia, to continue his education. During the First Balkan War, Princip traveled to Southern Serbia to volunteer with the Serbian army's irregular forces fighting against the Ottoman Empire but was rejected for being too small and weak. He also suffered from tuberculosis which was untreatable at the time and might have played a role in his motivation for the assassination.

Archduke Franz Ferdinand Carl Ludwig Joseph Maria of Austria (Francis Ferdinand, 18 December 1863 – 28 June 1914) was the heir presumptive to the throne of Austria-Hungary. His assassination in Sarajevo was the most immediate cause of World War I.

Franz Ferdinand was the eldest son of Archduke Karl Ludwig of Austria, the younger brother of Emperor Franz Joseph I of Austria. Following the death of Crown Prince Rudolf in 1889 and the death of Karl Ludwig in 1896, Franz Ferdinand became the heir presumptive to the Austro-Hungarian throne. His courtship of Sophie Chotek, a lady-in-waiting, caused conflict within the imperial household, and their morganatic marriage in 1900 was only allowed after he renounced his descendants' rights to the throne. Franz Ferdinand held significant influence over the military, and in 1913 he was appointed inspector general of the Austro-Hungarian armed forces.

Sophie, Duchess of Hohenberg (German: Sophie Marie Josephine Albina Gräfin Chotek von Chotkow und Wognin; Czech: Žofie Marie Josefína Albína hraběnka Chotková z Chotkova a Vojnína; 1 March 1868 – 28 June 1914) was the wife of Archduke Franz Ferdinand of Austria, the heir to the Austro-Hungarian throne. Their assassination in Sarajevo sparked a series of events that led, four weeks later, to World War I.

The ultimatum of July 23, 1914, was a diplomatic note delivered by the Austro-Hungarian ambassador in Belgrade to the Serbian Minister of Finance [fr]. The issuance of the ultimatum is widely seen as an immediate precursor to the outbreak of World War I in August 1914. The note was Austria-Hungary's response to the assassination of Archduke Franz Ferdinand by Serbia-aligned perpetrators the previous month, following weeks of deliberation.

The text was meticulously constructed to be unacceptable to the Serbian government, thereby ensuring its rejection and thus adding to Austria-Hungary's casus belli. Serbia's response was dismissed by the Austro-Hungarian government.