[American immigration policy and population].
Zheng
D
D
D000569:Americas; D003710:Demography; D019049:Developed Countries; D003906:Developing Countries; D004641:Emigration and Immigration; D009656:North America; D011153:Population; D011157:Population Dynamics; D011640:Public Policy; D014481:United States
Americas; Demographic Factors; Developed Countries; Developing Countries; Historical Survey; International Migration; Migration; Migration Policy; Migration, Internal; North America; Northern America; Policy; Population; Population Dynamics; Population Policy; Social Policy; United States