Were Serbia and Bugaria the independence states before World War One?

Question

My teacher told me Serbia and Bugaria were the independence state before World War One, is this ture?

Answer 1

Actually, your teacher is right.

However, the Treaty of Berlin of 1878, which was signed at the Congress of Berlin by the Great Powers, granted complete independence only to Serbia and Montenegro, leaving Bosnia and Raška to Austria-Hungary, who blocked their unification until the Balkan Wars of 1912 and 1913 and World War I.

On 28 June 1914 the assassination of Archduke Franz Ferdinand of Austria at Sarajevo in Austria-Hungary by Gavrilo Princip, a South Slav unionist, Austrian citizen and member of Young Bosnia, led to Austria-Hungary declaring war on Serbia.