Electoral research conducted by the AP found there have been at least 31 statewide recounts since 2000. Three of those changed the outcome of the election. The initial margins in those races were 137 votes, 215 votes and 261 votes.
Overall (and moving on), there is nothing unique about this election. Votes are never entirely counted on Election Day—Election Day winners are the result of projections by news organizations.
Here's a complete description of the election timeline. The results of the election are not officially final until the votes of the Electors are counted by Congress, and that happens, by law, on January 6.
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