What ethnic group inhabited most of Yugoslavia?

The ethnic group that inhabited most of Yugoslavia was the South Slavs, which included several distinct nationalities such as Serbs, Croats, Bosniaks, Slovenes, Macedonians, and Montenegrins. Each of these groups had its own language, culture, and historical background, contributing to the diverse tapestry of the region. The complexity of ethnic identities in Yugoslavia played a significant role in the political and social dynamics, especially during the country's dissolution in the 1990s.