No modern presidential candidate has refused to concede. Here’s why that matters.

The formal concession speech has played a vital role in even the most divisive U.S. elections, from the Civil War to Bush v. Gore.

Even though Joe Biden has secured enough votes to become president-elect of the United States, President Donald Trump has given every indication that he won’t accept the result as fair. Trump also has refused to commit to a peaceful transfer of power.

Both moves would be historical firsts if Trump refuses to concede even after all legal challenges are resolved. U.S. history has seen a handful of bitterly contested elections, most recently in 2000, when Democrat Al Gore called Republican George W. Bush to concede in the early hours after election night—only to call back back and retract his concession when the race unexpectedly tightened up. While their first conversation was congenial, the second was tense, with

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