-
Period: to
1914-1918
-
Assasination of Archduke Franz Ferdinand
Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by Serbian nationalist -
Austria-Hungary declares war on Serbia
Austria- Hungary declares war on Serbia -
Germany declares was on Russia
Outbreak of war - Germany declares war on Russia -
Germany declares war on France
Germany declares war on France -
The United Kingdom declares war on Germany
The United Kingdom declares war on Germany, after Germany invades Belgium. -
Austria-Hungary declares war on Russia and Serbia declares war on Germany.
Austria-Hungary declares war on Russia and Serbia declares war on Germany. -
U.S. President Woodrow Wilson announces the U.S. will remain neutral.
U.S. President Woodrow Wilson announces the U.S. will remain neutral. -
Second Battle of Ypres
First use of poison gas by Germany starts Second Battle of Ypres -
The British ocean liner RMS Lusitania is sunk
U-boat sinks British liner Lusitania with the loss of American lives, creating a US-German diplomatic crisis -
Germans capture Warsaw
Germans capture Warsaw -
Battle of Verdun Begins
German attack on Verdun in the longest battle of the war, ultimately defended by the French at great cost to both sides -
Italy Declares war on Germany
-
U.S. President Woodrow Wilson issues his Fourteen Points to peace
U.S. President Woodrow Wilson issues his Fourteen Points to peace -
Zimmerman Telegraph Intercepted
Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message. -
Germany announces unrestricted submarine warfare
Germany announces unrestricted submarine warfare -
The United States declares war on Germany.
The United States declares war on Germany.