Cabeza de Vaca was shipwrecked on the Texas coast in 1528 and spent several years among the Indians of that area. He tells of two tribes, Marianes and Yguaces, who killed all their girl babies and gave them to dogs to eat. Their reasoning was that it was bad to marry their own kin, and if they gave their daughters to other tribes they would bear children and cause their enemies to multiply (since all the other tribes were their enemies). They obtained wives by buying them from other tribes.
What he described was a a brutal insurance against inbreeding...almost all tribal societies merely have the young women leave the village. It has been theorized by evolutionary biologists that the reason teenage girls are so at odds with their mothers is a remnant of one way to ensure out-migration of the women. Another point is this: when a young adult lives at home, it's usually the son and not the daughter.
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