United States Census – Wikipedia

The United States Census is a decennial census mandated by Article I, Section 2 of the United States Constitution, which states: “Representatives and direct Taxes shall be apportioned among the several States… 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 …

: https://en.wikipedia.org/wiki/United_States_Census