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June 28, 1914 - Assassination of Franz Ferdinand

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June 28, 1914 - Assassination of Franz Ferdinand

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

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

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September 5-12, 1914 - 1st Battle of the Marne

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September 5-12, 1914 - 1st Battle of the Marne

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The French Army and British Expeditionary Force (BEF) battle against the Germans. The Germans invaded Belgium and were advancing too close to Paris. The French won in a quick victory.

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*May 7, 1915 - Sinking of the Lusitania  

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*May 7, 1915 - Sinking of the Lusitania  

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A German U-boat sends a torpedo straight for a British passenger ship, which was holding illegal weapons and supplies for Allies. The sinking caused the death of 128 Americans. This made President W. Wilson angry.

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This was a telegram written by Author Zimmermann, sent from Germany to Mexico. It said that if Mexico went to war with the U.S., then Germany would give them American land. Great Britain and America found out about it.

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April 6, 1917 - America Officially Joins the War

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April 6, 1917 - America Officially Joins the War

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This peace treaty ended the war between Russia and Germany. The treaty lowered Russia's population, as well as made them pay for war reparations. After the signing, Germany was able to focus on the Western Front.

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President W. Wilson passed the Sedition Act which expanded limitation on speech. It made it illegal to speak anything harmful or against the U.S. government or military. It was a violation to the 1st amendment and people didn't seem to have a problem with it.

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The French and German armies fought in the the Battle of Soissons. The Germans suffered more casualties and almost half of the U.S. Marine Brigade were killed. The French were victorious and recaptured most of the land they had lost.

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This battle marked the beginning of what was called the "hundred days". Allied troops won the battle against the Germans. The Germans suffered their greatest defeat in the war with 26,000 casualties.

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September 12, 1918 - Battle of Saint-Mihiel

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September 12, 1918 - Battle of Saint-Mihiel

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This battle was the first American led attack against a German Salient. The U.S. troops made a surprise attack which ended the war in only one day. This victory established American Armies as an effective fighting force.

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September 26-November 11, 1918 - Meuse-Argonne Offensive

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September 26-November 11, 1918 - Meuse-Argonne Offensive

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This was one of the Allied attacks that brought an end to the war. It was one of the deadliest campaigns in American history. It was also the largest operation of the American Expeditionary Forces (AEF).

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November 11, 1918 - Germany Signs Armistice

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November 11, 1918 - Germany Signs Armistice

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June 28, 1919 - Treaty of Versailles is signed

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June 28, 1919 - Treaty of Versailles is signed

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The Treaty of Versailles officially ended WWI. It was signed at the Palace of Versailles in Paris, France in the Hall of Mirrors. It was signed by the Allies and Germany.