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Assassination of Archduke Francis Ferdinand (June 28, 1914)

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Assassination of Archduke Francis Ferdinand (June 28, 1914)

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The assassination of Archduke Franz Ferdinand of Austria-Hungary by Gavrilo Princip in Sarajevo sparked the beginning of World War I.

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Austria-Hungary declares war on Serbia (July 28, 1914)

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Austria-Hungary declares war on Serbia (July 28, 1914)

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Austria and Hungary declared war on Serbia, leading to the formation of several alliances that escalated the conflict into a global war.

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Start of the Battle of Verdun (February 21, 1916)

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Start of the Battle of Verdun (February 21, 1916)

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The Battle of Verdun between the French and German armies lasted 10 months and resulted in heavy casualties, symbolizing the brutality of trench warfare.

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Start of the Battle of the Somme (July 1, 1916)

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Start of the Battle of the Somme (July 1, 1916)

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The Battle of the Somme caused heavy casualties on both sides and marked the first time tanks were used, embodying the deep-seated nature of World War I warfare.

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The sinking of the passenger liner Lusitania (May 7, 1915)

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The sinking of the passenger liner Lusitania (May 7, 1915)

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The sinking of the German submarine Lusitania killed more than 1,100 passengers, including 128 Americans, and tensions between the United States and the United States increased.

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Germany begins its final offensive (March 21, 1918)

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Germany begins its final offensive (March 21, 1918)

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Germany launched its final offensive on the Western Front in an attempt to break the stalemate before new American forces moved in to change the balance of power.

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The United States declares war on Germany (April 6, 1917)

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The United States declares war on Germany (April 6, 1917)

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The United States formally entered World War I, strengthening the Allied forces and significantly influencing the outcome of the conflict.

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Germany signs the Armistice at Compiègne (November 11, 1918)

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Germany signs the Armistice at Compiègne (November 11, 1918)

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Germany signed the Armistice at Compiègne, effectively ending World War I and leading to negotiations for peace.

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The signing of the Treaty of Versailles (June 28, 1919)

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The signing of the Treaty of Versailles (June 28, 1919)

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The Treaty of Versailles, signed at the Palace of Versailles, officially ended World War I, and Germany suffered enormous reparations and territorial losses.

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The Treaty of Versailles takes effect (January 10, 1920)

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The Treaty of Versailles takes effect (January 10, 1920)

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The Treaty of Versailles took effect, reshaping the geopolitical landscape of Europe and setting the stage for future conflicts.