The short answer is Covid-19. Because of the pandemic, many states have made it easier to vote by mail so voters can avoid crowded polling places. But many Americans are worried about how this might affect the election results.
President Trump has repeatedly claimed that mail-in voting will lead to widespread voter fraud—the criminal attempt to increase or decrease the vote count. But experts say there’s little evidence to support that claim.
“It’s actually really, really rare because most people aren’t going to risk going to jail for five years to cast one fake vote,” says Wehle.
Meanwhile, many people worry that the flood of mail-in ballots will lead to delivery delays, meaning their votes may not be counted on time. However, the U.S. Postal Service says voters can rely on it for “timely delivery of election mail.”
With more mail-in ballots, it will take election officials longer to tally the results. Some experts say it could be days or weeks before we know who won the presidential election.