World War 1

Assassination of Archduke Ferdinand

Jun 28, 1914

[Archduke Ferdinand][https://www.history.com/this-day-in-history/archduke-ferdinand-assassinated]

Austria Hungary declares of War on Serbia

Jul 28, 1914

[Austria declares war on Serbia][https://www.history.com/this-day-in-history/austria-hungary-declares-war-on-serbia]

First Battle of the Marne

Sep 6, 1914

First Battle of the Marne

First Battle of Ypres

Oct 19, 1914

First Battle of Ypres

Lusitania Sinks

May 7, 1915

Lusitania Sinks

Battle of the Somme

Jul 1, 1916

[The Battle of Somme][https://www.history.com/topics/world-war-i/battle-of-the-somme]

Zimmerman Telegram

Jan 6, 1917

Zimmerman Telegram

United States Declaration of War against Germany

Apr 2, 1917

[United Stated declares war against Germany][https://www.army.mil/article/7916/us_declares_war_on_germany]

United States Enter War

Apr 6, 1917

U.S. Enter's War

Battle of Vimy Ridge

Apr 9, 1917

Battle of Vimy Ridge

Battle of Passchendaele

Jul 31, 1917

Battle of Passchendaele

United States Declaration of War on Austria-Hungary

Dec 7, 1917

[United States declare war against Austria-Hungary][https://www.centenarynews.com/article/the-us-declares-war-on-austria-hungary-7-december-1917]

Armistice Day

Nov 11, 1918

Armistice Day

Treaty of Versailles

Jun 28, 1919

Signing of the Treaty of Versailles