Final answer:
Americans may find matrilineal descent unnatural due to the prevalence of patrilineal and bilateral descent patterns in their society, where children often inherit their father's surname despite recognizing descent from one mother.
Step-by-step explanation:
The concept of matrilineal descent is often perceived as unnatural to many Americans due to the prominence of patrilineal descent in Western societies. In a matrilineal system, lineage is traced through the mother's line, with significant implications for property inheritance, clan affiliation, and political power. This could be difficult to relate to in a society where bilateral descent is the norm, tracing kinship through both parents.
In the United States and other nations following a bilateral system, children often inherit their father's surname, suggesting a subtle skew toward a patrilineal descent pattern. Hence, despite acknowledging descent from one mother, the prevailing practice emphasizes the paternal lineage, making matrilineal descent seem less familiar.
Matrilineal descent practices are found in various cultures around the world, including several indigenous peoples of North America such as the Crow and Cherokee tribes. In these societies, lineage and inheritance are unambiguous through the female line, resolving any uncertainty regarding maternity, unlike paternity. Matrilineality affirms a child's belonging to the mother's family, with uncles and maternal relatives often taking roles typically ascribed to fathers in patrilineal societies.