Después de Guerra Balcánica en 1913, La región de los Balcanes fue disputada entre Austria y Rusia, las cuales deseaban sustituir al imperio turco como potencia dominante, ambos estaban aliados con enemigos comunes, Rusia con Gran Bretaña y Francia y Austria-Hungría con el Alemania e Italia, cuando el príncipe heredero al trono de Austria-Hungría, Francisco Fernando fue asesinado, se activaron la alianzas, este enfrentamiento estalló como resultado directo de este hecho

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.