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Migrant Workers legislation Americas economics population social policy demography developing country Population Dynamics Agricultural Workers Developing Countries Political Factors Agriculture Developed Countries policy socioeconomic status United States North America social status health care manpower Health Manpower Socioeconomic Factors Migration Policy--changes socioeconomics Western Hemisphere Legislation--changes Article organization and management Organization And Administration employment status migration developed country Demographic Factors politics Emigration and Immigration Economic Factors Transients and Migrants social class Northern America Human Resources public policy employment Labor Force Population Policy