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The U.S. Census Bureau administers two major demographic data collections which you'll make use of in this class:
(1) The Decennial Census, which happens every 10 years and is intended to count all people in the United States.
(2) The American Community Survey (ACS), which is a yearly sampling program sent out to randomly selected households. The sampling data is used to create estimated data points for the years between the Decennial Census.