title: Undocumented immigration in the United States: some thoughts about research challenges, impacts and recent policy initiatives.
authors.forename: D G
authors.initials: DG
authors.lastname: Papademetriou
mesh_terms: D000569:Americas; D003710:Demography; D019049:Developed Countries; D004467:Economics; D004641:Emigration and Immigration; D004651:Employment; D005843:Geography; D006280:Health Workforce; D009656:North America; D009934:Organization and Administration; D011153:Population; D011157:Population Dynamics; D011640:Public Policy; D012106:Research; D012107:Research Design; D013672:Technology; D014171:Transients and Migrants; D014481:United States
keywords: Americas; Demographic Factors; Developed Countries; Economic Factors; Geographic Factors; Human Resources; Illegal Migrants; International Migration; Labor Force; Measurement; Migrants; Migration; Migration Policy; North America; Northern America; Obstacles; Organization And Administration; Policy; Population; Population Dynamics; Population Policy; Research And Development; Research Methodology; Social Policy; Technology; United States