It’s misleading, moreover, to claim that the citizenship question was “removed” from the census in 2010. As noted above, it was a standard question on census forms through 1950; then, for unexplained reasons, it was omitted in 1960 for everyone except residents of New York City and Puerto Rico. Beginning in 1970 and continuing through 2000, the Census Bureau used two different questionnaires to gather information: a short form sent to more than 80 percent of American households which did not inquire about citizenship, and a long form distributed to fewer than 20 percent of American households which did. The long form was discontinued after 2000, so in 2010 every household received the short form — meaning, in effect, that no one was asked for citizenship data in that year’s decennial census. But it wasn’t because any questions were “removed.”
The article you cited from snopes wrote: