Net immigration of gainful workers into the United States, 1870-1930.
D004641:Emigration and Immigration / Q000266:history*; D005006:Ethnicity; D005060:Europe; D005260:Female; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008297:Male; D009790:Occupations / Q000145:classification; D012737:Sex Factors; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014481:United States