Archduke Franz Ferdinand was the heir presumptive to the Austro-Hungarian throne from 1896 until his assassination in 1914.

Archduke Franz Ferdinand and his wife Sophie were assassinated in Sarajevo, the capital of Bosnia and Herzegovina, on June 28, 1914.

Gavrilo Princip, a Bosnian Serb nationalist and member of the Black Hand, a secret society seeking the unification of all South Slavic peoples, assassinated Archduke Franz Ferdinand.

The Black Hand aimed to unite all South Slavic peoples into a single state, known as Yugoslavia, and saw the assassination as a means to achieve this goal.

Austria-Hungary issued an ultimatum to Serbia, demanding that it punish those responsible for the assassination, suppress anti-Austrian propaganda, and allow Austrian officials to investigate the crime. Serbia rejected the ultimatum, leading Austria-Hungary to declare war on Serbia on July 28, 1914.

The assassination of Archduke Franz Ferdinand triggered a chain of events that led to the outbreak of World War I on July 28, 1914.

World War I involved 32 countries, including the major powers of Europe and their respective allies.

The Central Powers consisted of Germany, Austria-Hungary, and the Ottoman Empire.

The Allied Powers consisted of France, Russia, and the United Kingdom.

World War I resulted in the deaths of an estimated 17 million people.

The Treaty of Versailles was the peace treaty that ended World War I, signed on June 28, 1919.

The Treaty of Versailles required Germany to cede territory to the Allied Powers, pay reparations, and disarm its military.

The League of Nations was an international organization established after World War I to promote peace and cooperation among nations.

The League of Nations failed due to a lack of support from major powers, its inability to resolve international conflicts, and the outbreak of World War II.

The assassination of Archduke Franz Ferdinand serves as a reminder of the importance of diplomacy and peaceful conflict resolution, the dangers of nationalism and extremism, and the need for international cooperation and collective security.