The Triple Entente is Formed-It consisted of France, Britian and Russia.
-They opposed the Central Powers
The Triple Alliance is Formed-It consisted of Germany, Austria-Hungary, and Italy.
Austria-Hungary Takes Control of Bosnia-This angered Serbians who felt the province should be theirs. Serbia threatened Austria-Hungary with war.
-Russia ,allied to Serbia mobilized it's forces.
Archduke Franz Ferdinand is Assassinated in Sarajevo-Serbian nationalist Gavrilo Princip stepped from the crowd and shot the Archduke and his wife Sophie.
-Princip was a member of the Black Hand, an organization promoting Serbian nationalism.
-The assassinations touched off a diplomatic crisis.
Austria-Hungary Declares War on Serbia-Declared war because of the assassination of Franz Ferdinand.
-Convinced that the Serbian government had conspired against them, Austria-Hungary issued Serbia an unacceptable ultimatum.
Germany Invaded Belgium-Used the Schlieffen Plan. This plan called for a holding action against Russia, combined with a quick drive through Belgium to Paris.
-After France had fallen, the two German armies would defeat Russia.
A German U-Boat Sinks the Lusitania-Of the 1,198 persons lost, 128 were Americans.
-The Germans defended their action on the grounds that the liner carried ammunition. Despite Germany’s explanation, Americans became outraged with Germany because of the loss of life.
-American public opinion turned against Germany and the Central Powers.
The First Battle of the Somme Begins
The Zimmerman Note is Discovered-A telegram from the German foreign minister to the German ambassador in Mexico that wasintercepted by British agents.
-The message proposed a German-Mexican alliance and promising to help Mexico regain Texas, New Mexico, and Arizona if the United States entered World War I.
The United States Declares War on Germany-Declared because of the Zimmerman Note.
-Mexico was going to ally itself with Germany.