How World War One caused fall of four empires

It was the assassination of an heir to the Austro-Hungarian empire that led to the start of World War One. In four years, the German, Austro-Hungarian and Ottoman empires would crumble to the devastation of the what was later called The Great War. And to what cost? TRT World's Christine Pirovolakis takes a look. #WorldWarOne #FallofEmpires