Authorizing legislation for the 1830 census. Expanded age categories, which were now to start at infancy and continue upward at ten-year intervals. Additionally, the date of enumeration was shifted from the late summer to springtime. There was to be no manufacturing census in 1830.
Authorizing legislation for the 1840 census. Did not, as previous laws had, list the specific questions to be asked. Instead, the law stipulated only broad categories to be addressed. This law was amended several times during the next two years, mostly to give the marshals and their assistants extra time to complete the population count.
Authorizing legislation for the 1850 and subsequent censuses. Laid out six specific questionnaires that covered the populations of free and slave inhabitants, agriculture, products of industry, social statistics, and vitality. The department responsible for the census was shifted from State to Interior.
Authorizing legislation for the 1900 and subsequent censuses. Originally restricted to inquiries "relating to population, to mortality, to products of agriculture and of manufacturing and mechanical establishments." Social and vitality statistics such as a population count of the deaf, blind, and dumb were only to be completed after these five required censuses. This rule was reversed by a 1900 amendment to the act, allowing those statistics to be collected along with the rest.
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