Census support for voting rights (1870)
<p>The fifteenth amendment was not ratified when the 1870 census forms were designed.  The last two questions in 1870 were</p>
<p><a href="https://i.stack.imgur.com/O2fsO.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/O2fsO.jpg" alt="enter image description here" /></a></p>
<p>Was this intended to support <a href="https://en.wikipedia.org/wiki/Fifteenth_Amendment_to_the_United_States_Constitution#Background" rel="nofollow noreferrer">Section 2 of the Fourteenth Amendment</a> (which punished, by reduced representation in the House of Representatives, any state that disenfranchised any male citizens over 21 years of age)?</p>

<p>Yes. See the discussion in the instructions to enumerators:</p>
<p><a href="https://www.archives.gov/files/research/genealogy/charts-forms/1870-census.pdf" rel="nofollow noreferrer">https://www.archives.gov/files/research/genealogy/charts-forms/1870-census.pdf</a></p>

united-states voting census