Confused and don't know where to start? Check out the "Which Data Table or Tool Should I Use?" under the Guidance tab on the American Community Survey's page.
"Representation and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers ... . The actual Enumeration shall be made within three Years after the first Meeting of the Congress of the United States, and within every subsequent Term of ten Years, in such Manner as they shall by Law direct."
-- Article I, Section 2 of the Constitution of the United States
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