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cultural anthropology educational status Americas economics population Migrants demography social change developing country Population Dynamics Developing Countries Socioeconomic Status--changes Ethnic Groups ethnic group Developed Countries United States Cultural Background North America Occupations sociology health care manpower Health Manpower occupation Socioeconomic Factors socioeconomics Western Hemisphere Article migration international migration developed country population and population related phenomena Demographic Factors Emigration and Immigration Economic Factors Transients and Migrants social class Northern America Population Characteristics Human Resources Occupations--changes Culture