Did The annexation of Bosnia and Herzegovina by Austria-Hungary in 1908 caused serious bitterness between Serbia and Austria-Hungary.?

Yes, the annexation of Bosnia and Herzegovina by Austria-Hungary in 1908 created significant tensions between Serbia and Austria-Hungary. Serbia viewed the annexation as a direct threat to its national interests and ambitions in the Balkans, particularly since many ethnic Serbs lived in the newly annexed territories. This resentment contributed to rising nationalism in Serbia and set the stage for further conflicts, ultimately playing a role in the events leading up to World War I.