Why 'close-call' presidential elections are happening more often

Although the country has historically seen some incredibly tight elections—including a literal tie in 1800—polarization is making such victories increasingly likely.

In U.S. presidential elections, it’s rare that the race is so close that the nation goes to bed on election night not knowing who won. Yet that’s what America woke up to on the day after—a contest between Democrat Joe Biden and incumbent Republican President Donald Trump that remains too close to call, even with a record-shattering voter turnout.

Votes are still being counted, but in an unprecedented election night declaration, Trump claimed victory in the wee hours and called for vote-counting to halt as he made allegations of fraud despite lack of evidence. The vote-counting continues, as it does in every election, as absentee and mail-in ballots are tallied. Amid the pandemic, a record-breaking number of these ballots were used

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