United States Census, 1870

The United States Census of 1870 was the ninth United States Census. Conducted by the Census Bureau in June 1870, the 1870 Census was the first census to provide detailed information on the black population, only years after the culmination of the Civil War when slaves were granted freedom. The population was said to be 38,555,983 individuals, a 22.62% increase since 1860. The 1870 Census' population estimate is controversial, as many believed it underestimated the true population numbers, especially in New York and Pennsylvania.

Under the Census Act of 1850, two new structural changes during the 1870 Census occurred: marshals had to return the completed population questionnaire to the Census Office in September and penalties for refusing to reply to enumerator questions were extended to encompass every question on the questionnaires.

The commonly past-used slave questionnaires were redesigned to reflect the American society after the Civil War. The five schedules for the 1870 Census were the following: General Population, Mortality, Agriculture, Products of Industry, and Social Statistics.

The general population saw a 22.62% increase to 38,555,983 individuals in 1870. Charges of an undercount, however, have been brought against Francis Amasa Walker, the Superintendent of the Census.

Mortality rates in 1870, in general, decreased as a fraction of the total population by 0.03% from 1860 and by 0.11% from 1850. The lower death rates indicate that the standard of living increased, due to some exogenous factor, over the period of twenty years from 1850 to 1870.

In terms of products of industry, total U.S. wealth increases by 17.3% from 1860 to 1870, to reach an assessed wealth of $14,178,986,732. The four main state contributors to this wealth were New York, Massachusetts, Pennsylvania, and Ohio, in that order. Most of the wealth was concentrated in the developed Northeast region, as newer states like Wyoming were beginning to develop their young economies.

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