Millions of residents across Pennsylvania’s 67 counties have cast their votes for who they want to be the next president of the United States. Most polls in Pennsylvania will close at 8 p.m., which kicks off the counting of ballots that Americans across the country will closely watch.

We’ve written for months about the strategies former President Donald Trump and Vice President Kamala Harris are taking to win Pennsylvania. If polls prove true and this is the closest presidential election in history, it could come down to any small ...