Lewis Henry Morgan is known for his interest in which aspect of anthropological study?

Lewis Henry Morgan is renowned for his extensive work in the study of kinship and family organization, making this the correct answer. His pioneering research laid the foundation for understanding how societies structure their social relations through family ties and descent systems.

Morgan conducted in-depth ethnographic studies, mainly focusing on Native American societies, where he meticulously documented their kinship terminology and practices. This analysis revealed how different cultures organize their relationships, often distinguishing between matrilineal and patrilineal descent, which has significant implications for understanding inheritance, social status, and community dynamics.

His seminal work, "Systems of Consanguinity and Affinity of the Human Family," presented the idea that kinship is a fundamental and organizing principle in human societies. This shift in focus towards the significance of kinship relations marked a critical moment in anthropology, influencing subsequent generations of anthropologists to explore the intricate ways that families and kinship networks shape cultures.