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Archduke Franz Ferdinand of Austria,
Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne and his wife Sophie, Duchess of Hohenberg were assassinated in Sarajevo on 28 June 1914, -
Austria-Hungary declares war on Serbia,
Austria-Hungary declared war on the Slavic country on this day in 1914, sparking World War I. -
Great Britain declared war on Germany
Great Britain declared war on Germany at 11:00 p.m. for violating Belgian neutrality. The United States declared neutrality at the outbreak of World War I. With Great Britain formally at war, the Dominions of Australia, Canada, and New Zealand entered World War I. -
the German submarine(U-boat)
Lusitania, British ocean liner, the sinking of which by a German U-boat on May 7, 1915, contributed indirectly to the entry of the United States into World War I. -
Battle of Krivolak
The French failed to capture an important Bulgarian stronghold located at a monastery in the Vardar Macedonia region. -
The British intercept a telegram sent by Alfred Zimmermann
The British intercept a telegram sent by Alfred Zimmermann in the German Foreign Office to the German embassies in Washington, D.C., and Mexico City. Its message outlines plans for an alliance between Germany and Mexico against the United States. -
United States formally declared war against Germany
the United States formally declared war against Germany and entered the conflict in Europe. ... For three years, President Woodrow Wilson strove to maintain American neutrality. Anti-war sentiment ran across the political spectrum -
Battle of Mount Ortigara
Shock troops with the Austro-Hungarian Army pushed 11 Italian divisions off the Mount Ortigara summit, regaining their important defensive position in Asiago, Italy. -
western front fell
On Nov. 11, 1918, after more than four years of horrific fighting and the loss of millions of lives, the guns on the Western Front fell silent. Although fighting continued elsewhere, the armistice between Germany and the Allies was the first step to ending World War I. -
Treaty of Versailles,
Five years later, on June 28, 1919, Germany and the Allies signed the Treaty of Versailles, formally ending World War I and providing for the creation of the League of Nations.