Undocumented residents in the United States in 1990: issues of uncertainty in quantification.
"Uncertainties are abundant about the measurement of net undocumented migration [to the United States] and change over the past two decades.  This analysis presents possible upper and lower boundaries on components for estimating legal migration in 1980-1989 and on the foreign-born population in 1990. Positing ranges for net undocumented immigration, between 2 million and 4 million undocumented residents may have been counted in the 1990 census. The total number of undocumented residents may have been as high as 6 million."
D000569:Americas; D003710:Demography; D019049:Developed Countries; D004641:Emigration and Immigration; D005006:Ethnicity; D009656:North America; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics; D012106:Research; D012107:Research Design; D013223:Statistics as Topic; D014171:Transients and Migrants; D014481:United States
Americas; Demographic Factors; Developed Countries; Estimation Technics; Foreigners; Illegal Migrants; International Migration; Measurement; Migrants; Migration; Nationality; North America; Northern America; Population; Population Characteristics; Population Dynamics; Research Methodology; United States