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- National origins of European Americans in 1790, according to a preliminary government estimate in 1909 Census Bureau report A Century of Population Growth and revised scholarly estimates produced in collaboration with the American Council of Learned Societies in time for fiscal year 1929 . The 1909 figures were first accepted for quota calculation in 1926, but the accuracy came under scrutiny for using an unscientific methodology that significantly overestimated the English share of the population—the primary reason the quota formula due to take effect in 1927 pursuant to §11 was delayed for two years until more precise revised estimates were available, given their importance as basis for calculating the origins of the total national stock. (en)
- National origins of the white population of the United States in 1920, computed for apportionment of annual immigration quotas according to National Origins Formula, as prescribed by §11 of the Immigration Act of 1924. About 45% of white Americans were deemed of colonial stock, 21.6% were grandchildren and later generations of post-colonial immigrants, and 1/3 were immigrants or children of immigrants in 1920. (en)
- Introduction to the process of National Origins Formula quota computation as prescribed by subsections , , of §11 of the Immigration Act of 1924, in a 1950 report by a Senate Committee chaired by Pat McCarran. Describing the formula in effect since 1929 as “cumbersome”, the consequent 1952 McCarran–Walter Act adopted a simplified formula intended to arrive at roughly-equivalent results. (en)
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