How a single assassination in Sarajevo ignited a global catastrophe

The Great War begins | The 20th century | World history | Khan Academy · 6:12 · Video: Khan Academy · Watch at the source

In short: At the dawn of the 20th century, few predicted that a local act of violence would trigger a world war. The Great War began not as an inevitable clash, but as a rapid escalation of alliances and fears that transformed lives across continents.

The spark occurred on June 28, 1914, when Austrian Archduke Franz Ferdinand and his wife, Sophie, were assassinated in Sarajevo. The city was located in Bosnia, a territory recently annexed by the Austrian Empire. This move deeply angered many Bosnians and their Serbian neighbors, who resented foreign rule. A small group of Serbian dissidents seized this opportunity to strike against the Archduke's visit.

The conflict escalated through a complex web of treaties. Austria-Hungary declared war on Serbia with support from its ally, Germany. This prompted Russia, France, and Belgium to enter the fray. Great Britain joined the fight primarily out of fear that German actions would threaten vital sea routes. By this point, nations were divided into two primary camps: the Central Powers (including Bulgaria and the Ottoman Empire) and the Allies (initially Russia, France, Belgium, and Great Britain).

The war soon devolved into a grueling stalemate defined by trench warfare in France and Belgium. Soldiers lived in fortifications dug up to 12 feet deep, often reinforced with sandbags or wooden beams. These defenses hindered advancement, prolonging the conflict for years. In the 'No Man’s Land' between these lines, soldiers faced constant threats from barbed wire, explosive mines, snipers, and grenades.

The human cost was exacerbated by horrific living conditions. Even during lulls in combat, daily deaths occurred from disease or sniping. The unsanitary environment led to outbreaks of dysentery, typhus, and cholera. Soldiers also suffered from trench mouth—caused by bacteria, smoking, and malnutrition—and trench foot, a fungal disease resulting from prolonged exposure to cold water.

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