This March 23, 2018, file photo shows an envelope containing a 2018 census letter mailed to a U.S. resident as part of the nation's only test run of the 2020 Census. The Supreme Court will decide whether the 2020 census can include a question about citizenship that could affect the allocation of seats in the House of Representatives and the distribution of billions of dollars in federal money. (AP Photo/Michelle R. Smith, File)
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