Alliance between Britain, France, and Russia against Germany and Austria-Hungary
They all entered the war as Allies
Archduke Franz Ferdinand was assassinated in Sarajevo
He was heir to the Austrian throne
Austria-Hungary Declares War on Serbia
The man who assassinated the Archduke Ferdinand was from Serbia.
After that, Austria Hungary declared war on them.
The Triple Alliance is Formed
They were Italy, Austria-Hungary, and Germany
They were later known as the Central Powers.
Germany Invaded Belgium
They used a plan known as the Schlieffen Plan
They would hold Russia and quickly defeat Belgium and France
Austria-Hungary Takes Control of Bosnia
Bosnia had little power so they were small and vulnerable.
Bosnia resented Austria Hungary
A German U-Boat Sinks the Lusitania
1,198 British persons died, along with 128 Americans.
The U.S.'s anger towards Germany and the Central Powers also led them to support the Allies.
The Zimmerman Note is Discovered
The Zimmerman note was a note from the German foreign minister to the German ambassador in Mexico to try to help support Mexico against the U.S.
It was intercepted by the British and shared with the Americans.
The United States Declares War on Germany
After the Zimmerman note, the U.S. felt threatened so they declared war.
They supported the Allies
The First Battle of the Somme Begins
It was a disastrous British offensive
It was the first major battle that would lead to the war.