How did the Sakalava empire unite diverse west-coast clans?

The Sakalava empire unified diverse west-coast clans primarily through the expansion of the Maroserana dynasty, which established the states of Menabé and Boina in western Madagascar.1

This unification was achieved through several key mechanisms:

• Social Integration: The original Sakalava warriors and their descendants intermarried and merged with hundreds of local west-coast clans, effectively extending "Sakalava citizenship" to these groups.1
• Religious Cohesion: A shared sense of identity was fostered through a common religious framework. Upon their death, Maroserana royals were elevated to become the sacred ancestors of all Sakalava people, creating a unifying spiritual bond across the diverse clans.1
• Military and Economic Power: The empire solidified its influence by controlling trade in cattle and slaves with Europeans, which provided the resources—specifically guns—necessary to maintain authority over a vast territory.21

While these factors created a powerful state, the empire eventually declined due to internal power struggles, religious tensions regarding the ancestral cult, and military pressure from the expanding Merina kingdom.21