In following the ongoing US election, I notice that most states seem to count votes much faster on day 1. For example on election night, Pennsylvannia counted ~80% of its total votes, but it's been several days since and they still haven't counted the remaining 20%.

Why is the pace of vote counting so fast on the first day? Why does it slow down afterwards?

  • The Pennsylvania legislature forbade its election officials from processing mail-in ballots before polls closed on Election Day. Those ballots piled up, flattened and folded, in some cases for weeks. – David Hammen Nov 7 '20 at 9:31

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