At the foot of Mount Rushmore on the eve of Independence Day, President Donald Trump made a direct appeal to disaffected white voters four months before Election Day, accusing protesters who have pushed for racial justice of engaging in a “merciless campaign to wipe out our history.” The president dug further into American divisions Friday, offering a discordant tone to an electorate battered by a pandemic and wounded by racial injustice following the high-profile killings of Black people. He zeroed in on the desecration by some protesters of monuments and statues across the country that honor those who have benefited...