During the past four decades, [[Family history|historians and historical demographers]] have argued that historical Northwest Europe and North America had a unique family system characterized by neolocal marriage and nuclear family structure. In other societies--such as Eastern Europe, Asia and Africa--powerful clans, senior patriarchs, and duties to and extended kinship networks were dominant factors in shaping extended families. | During the past four decades, [[Family history|historians and historical demographers]] have argued that historical Northwest Europe and North America had a unique family system characterized by neolocal marriage and nuclear family structure. In other societies--such as Eastern Europe, Asia and Africa--powerful clans, senior patriarchs, and duties to and extended kinship networks were dominant factors in shaping extended families. |