Outbreak of World War I

Austria-Hungary Takes Control of Bosnia

Jul 1, 1878

It was an event when Austria-Hungary announced the annexation of Bosnia and Herzegovina. Also known as the First Balkan Crisis.

Triple Alliance is Formed

May 20, 1882

Name of the alliance between Germany, Austria-Hungary, and Italy.
Was the opposing force of the Triple Entente during the war.

Triple Entente is Formed

Aug 31, 1907

Name of the alliance of France, Britain, and Russia during the first World War
Was the opposing force of the Triple Alliance during the war

Archduke Franz Ferdinand's Assassination

Jun 28, 1914

Archduke Ferdinand was assassinated by Gavrilo Princip. The purpose of the assassination was to create Yugoslavia.

Austria-Hungary Declares War on Serbia

Jul 28, 1914

After a month of the death of Archduke Franz Ferdinand, Austria-Hungary declared war on Serbia. This event was the beginning of World War I.

Germany Invaded Belgium

Aug 4, 1914

The Germans invaded Belgium because they needed to move closer to France for fighting. Many Belgiums were injured or killed during this time and many left the country.

Germand U-Boat Sinks the Lusitania

May 7, 1915

The Lusitania was torpedoed by the U-Boat off the coast of Ireland. There were 128 Americans on the boat, which sparked a dislike for Germans.

First Battle of the Somme Begins

Jul 1, 1916

Series of battles that took place on either sides of the Somme River, France. The battle was between the French army and the German army.

Zimmermann Note is Discovered

Jan 16, 1917

The note was a telegram from Germany to a German ambassador in Mexico that was intercepted by Britain. Zimmermann told the ambassador that if the U.S. decided to enter the war, they were to get help from Mexico.

U.S. Declares War on Germany

Apr 2, 1917

President Wilson appeared before Congress and asked them to agree to declaring war on Germany. President Wilson decided on this after reading the Zimmermann note, but was still anxious to enter the war.