What was the affect austria Hungary annexation of bosnia and herzegovina?

The annexation of Bosnia and Herzegovina by Austria-Hungary in 1908 heightened tensions in the Balkans and contributed to rising nationalism among Slavic groups, particularly Serbs, who viewed it as a threat to their aspirations for a unified South Slavic state. This act angered Serbia and Russia, leading to increased animosity and diplomatic conflicts in the region. Ultimately, this annexation played a significant role in the lead-up to World War I, as it intensified the rivalry among the Great Powers and destabilized the already volatile Balkan political landscape.