Answer
**Yugoslavism**, as proposed by Petar II Petrović-Njegoš, encompasses the aspiration for South Slavic unification and cooperation. Njegoš envisioned a unified state that would encompass all South Slavic peoples, sharing cultural and linguistic affinities, and free from foreign domination. This concept laid the foundation for the later creation of the Kingdom of Yugoslavia and influenced the broader Pan-Slavic movement.