The United States has been conducting a Census every 10 years since 1790.
Immediately after the new nation's constitution was enacted, the need for a count of the
population was called for. First of all, because the constitution calls for it (Article
1). But even more important is the fact that a state's congressional representatives and
voting districts are based upon these counts. Though crude compared to today's standards,
that first census netted a total population of 3.9 million people. The 2000 census
finds that we have grown to 281,421,906. In case you were counting, that is a
growth of over 7000% in 210 years!
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Growth in U.S. Resident Population: 1790
to 2000 Source: U.S. Census Bureau