Final answer:
A chiefdom is the type of social group where kin groups are ranked and the leader is usually a chief.
Step-by-step explanation:
The type of social group in which kin groups are ranked and the leader is usually a chief is a chiefdom.
Chiefdoms are a common form of political organization found in historical and contemporary societies around the world. In chiefdoms, power is concentrated in formal positions of authority, such as chiefs or kings, who inherit their leadership roles. These leaders may expand their dominion to multiple towns and villages, forming political alliances with other chiefs to create large hierarchical systems.
Examples of chiefdoms can be found in various regions, including Africa, Oceania, the Middle East, Europe, East and Southeast Asia, and North, Central, and South America.