Population exchange between Greece and Turkey is another reason .
These ancient Christian ethnic groups were drastically reduced by genocide during and after World War I ( see Armenian Genocide , Assyrian Genocide and Greek genocide ) at the hands of the Ottoman Turkish army and their Kurdish allies .
Population exchange between Greece and Ottoman Turkish is another reason .
These ancient Christian ethnic groups were drastically reduced by genocide during and after World War I ( see Armenian Genocide , Assyrian Genocide and Greek genocide ) at the hands of the Ottoman Turkish army and their Kurdish allies .