How we know Joe Biden won the 2020 presidential race

Joe Biden is president-elect of the United States. But President Donald Trump and his supporters aren’t giving up the race.

Trump has brought a barrage of legal challenges contesting vote totals in several key swing states. He has repeatedly made unfounded assertions of victory and allegations that widespread voter fraud affected the outcome of the election. And on social media, his supporters have backed him up.

Since Election Day, we’ve fact-checked dozens of posts that misconstrue small errors in the ballot-counting process as evidence of a nationwide, Democrat-led voter fraud...