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Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, was assassinated in 1914 by Gavrilo Princip, a Serbian nationalist. This event set off a chain reaction of political tensions and alliances, eventually leading to the start of World War I.

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In 1914, Austria-Hungary declared war on Serbia, following the assassination of Archduke Franz Ferdinand. This act marked a significant escalation in tensions and played a pivotal role in triggering the events that led to the outbreak of World War I.

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During World War I in 1914, Germany invaded Belgium as part of their plan to quickly defeat France. This invasion caused widespread destruction and drew other countries, including Britain, into the conflict.

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The First Battle of the Marne in 1914 was a crucial engagement during World War I, where French and British forces successfully halted the advancing German army near the Marne River in France. This marked a turning point in the war, preventing a German victory and leading to the establishment of trench warfare on the Western Front.

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The Battle of the Somme, fought in 1916 during World War I, was a major Allied offensive against German forces on the Western Front. It became one of the bloodiest battles in history, with significant casualties on both sides, but ultimately resulted in limited territorial gains for the Allies.

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The Zimmerman Telegram was a secret diplomatic communication sent by Germany to Mexico in 1917, proposing a military alliance against the United States. Intercepted by British intelligence, its revelation played a crucial role in influencing the United States to enter World War I on the side of the Allies.

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In 1917, the United States declared war on Germany and entered World War I. This decision was prompted by various factors, including the unrestricted submarine warfare by Germany, the interception of the Zimmerman Telegram, and the desire to uphold democratic principles and protect American interests.

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Woodrow Wilson's 14 Points were a set of principles outlined in 1918 to guide the post-World War I peace negotiations. They aimed to establish lasting peace, advocate for self-determination of nations, and promote a new international order based on diplomacy, open agreements, and the reduction of armaments.

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The Germany Armistice, signed on November 11, 1918, marked the end of World War I on the Western Front. It was an agreement between the Allies and Germany that suspended hostilities, leading to the eventual signing of the Treaty of Versailles in 1919.

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The Treaty of Versailles, signed in 1919, marked the formal end of World War I and imposed punitive measures on Germany. It imposed territorial losses, military restrictions, and financial reparations, contributing to post-war instability and laying the groundwork for geopolitical tensions that eventually led to World War II.