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α: calibrated so average coauthorship-adjusted count equals average raw count
This paper examines age-specific and differential fertility, both marital and total, and nuptiality for census samples of white Philadelphia families headed by native white Americans, Germans, and Irish for 1850–1880. Using Philadelphia Social History Project data, own-children techniques are employed to construct age-standardized child-woman ratios and age-specific total and marital fertility rates. Conclusions are that the low fertility among native whites was due to both low marital fertility and later marriage; that rapid declines in marital fertility occurred among second generation migrants; and that variations existed in marital fertility across occupational groupings within ethnic groups.