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evaluation Migrant Workers cultural anthropology socio-economic impact immigrant workers political challenge cultural difference South and Central America social psychology Americas Latin America economics population social policy demography Mexicans social change developing country Population Dynamics Developing Countries Political Factors Social Problems Ethnic Groups ethnic group Developed Countries policy USA Mexico United States Cultural Background North America sociology health care manpower labor migration Health Manpower Acculturation social problem Western Hemisphere cultural factor Article migration Prejudice developed country population and population related phenomena Demographic Factors politics Emigration and Immigration Evaluation Studies Economic Factors Transients and Migrants Northern America Population Characteristics social discrimination Human Resources public policy employment Labor Force Migration Policy Population Policy Culture English Abstract