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Heir to the throne of the Austro-Hungarian Empire and his wife are assassinated. -
declares war on Serbia. -
a secret alliance with Germany agreeing to enter the war once Germany declares war on Russia. They formally enter the war several months later on October 28,1914 when they bomb Russian sea ports. Bulgaria joins the Central Powers on October 15, 1915. -
declares neutrality in the war. -
neutral Belgium and invades Belgium and Luxembourg as part of the Schlieffen Plan. As a result, Britain declares war on Germany. -
declares war on Russia. -
Russia at the Battle of Tannenberg. -
France is halted at the First Battle of Marne. -
Sea ends when the Germans withdraw at the 1st Battle of Ypres. -
is declared by German and Allied soldiers in the trenches along the Western Front. -
unrestricted submarine warfare. -
poison gas at the 2nd battle of Ypres. -
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sinks the Lusitania killing 1,198 civilians, including 128 Americans. -
for the Turkish peninsula of Gallipoli. -
is executed by the Germans. -
is fought resulting in an estimated one million casualties. -
tank during the Battle of Somme. The battle results in an estimated one million casualties. -
re-elected President of the United States. -
a telegram from German Foreign Minister Arthur Zimmerman to the German Minister of Mexico. -
of Russia abdicates. -
his Fourteen Points in a speech before Congress. -
the U.S. Congress for a declaration of war against Germany. -
known as Passchendaele, results in minor gains for the Allies and a total of 700,000 casualties.
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is presented in London. -
signed between Russia and Germany. -
of the Marne near Paris are stopped by American forces at Chateau-Thierry. -
of Germany abdicates. -
war on the Western Front ends as Germany and the Allies sign an Armistice. -
abdicates -
The U.S. Senate later refuses to ratify it. -
ends the war on the Eastern Front with the Ottoman Empire.