World War I

Franz Ferdinand Assassination

Jun 28, 1914

Franz Ferdinand and his wife were assassinated while visiting Sarajevo, Bosina. He was next in line for Austro-Hungarian throne. The killings set off decades of old tensions in Europe and started World War I

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

Jul 28, 1914

Due to the assassination of Archduke Franz Ferdinand (air to the Austria-Hungarian throne) who was assassinated by a member of the Serbian Nationalist group, Austria-Hungary declared war on Serbia.

First use of gas as a weapon by the Germans (April 1915)

1915

German forces release 105 tons of lethal Chlorine gas against the Allied soldiers. It was the first poisonous gas attacks and it devastated the Allied line.

Sinking of the Lusitania (May 7,1915)

May 7, 1915

The Lusitania, a British ocean liner, war torpedoed without warning by a German U-boat off the coast of Ireland.1,198 people died including 128 Americans.

Wilson reelected; pledged American neutrality (November 1916)

1916

"Everything I love most in the world is at stake." A German victory, Wilson said, "would be fatal to our form of government and American ideals."

Zimmermann Note ( January 1917)

1917

It was a secret alliance between Germany and Mexico in case the U.S entered WWI.

Bolsheviks led by Lenin over through Russian government (November 1917)

1917

The Bolsheviks led by Lenin over through Alexander Kerensky.

U.S. declares war (April 1917)

Apr 2, 1917

After Germany sunk four U.S. merchant ships, Woodrow Wilson asks Congress for declaration of war against Germany.

War ends (November 11, 1918)

Nov 11, 1918

Germany signed an armistice agreement with the Allies outside Compiégne, France.

Treaty of Versailles (June 28,1919)

Jun 28, 1919

The war officially ended with the Treaty of Versailles. It ended the sate of war with the Allied powers and Germany.