The war started because of heated tensions between Hungry-Austria and Serbia. One of the war's main causes was the assassination of Archduke Franz Ferdinand (Archduke of Austria-Hungry).
The event came after a long and hard series of diplomatic clashes between the Great Powers that include (Italy, France, Germany, the British
Empire, the Austria-Hungarian Empire and Russia) over European and colonial issues in the first decade of the 1900s that had left tensions and moods heated. In turn these diplomatic clashes can be traced to changes in the balance of power in Europe since 1867.One of the immediate causes for the war was tensions over a strip of land called the Balkans. Austria-Hungry competed with Serbia and Russia for territory and influence in the region and they pulled the rest of the Great Powers into the conflict through their various alliances and treaties.
The event came after a long and hard series of diplomatic clashes between the Great Powers that include (Italy, France, Germany, the British
Empire, the Austria-Hungarian Empire and Russia) over European and colonial issues in the first decade of the 1900s that had left tensions and moods heated. In turn these diplomatic clashes can be traced to changes in the balance of power in Europe since 1867.One of the immediate causes for the war was tensions over a strip of land called the Balkans. Austria-Hungry competed with Serbia and Russia for territory and influence in the region and they pulled the rest of the Great Powers into the conflict through their various alliances and treaties.