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Why could an Iroquois child not marry someone from the same maternal clan?

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totem fish mask — Totemism Totem fish mask from the Orokolo Bay area of New Guinea. Painted bark cloth over rattan frame with fringe of dried grass. Height 1.63 m.

Among the Iroquois, clans are matrilineal social units, meaning a child is automatically a member of their mother’s clan. Because members of a clan consider themselves to be related—regardless of whether a specific genetic link can be traced—clans are strictly exogamous, or out-marrying.1

Consequently, an Iroquois child could not marry another member of their own maternal clan because such a union was considered incestuous. This practice of exogamy served as a vital stabilizing device, ensuring that clan members maintained their reciprocal obligations and social cohesion within the community. Membership in a clan was for life, and because these groups functioned as extended kin, the prohibition against marrying within one's own clan reinforced the fundamental belief that all members of the group shared a familial bond.12