The serbs' wish to unite all the Slavs in one empire is an examples of?

The Serbs' wish to unite all Slavs in one empire is an example of nationalism, specifically the concept of pan-Slavism. This movement sought to promote the unity and cultural identity of Slavic peoples, often in opposition to the influence of larger empires, such as the Austro-Hungarian Empire. Such aspirations contributed to regional tensions and conflicts, particularly in the Balkans during the late 19th and early 20th centuries.