Explanation:
John Adams, his son John Quincy Adams and Andrew Johnson — three presidents who were bitterly at odds with those who unseated them. All three men served no more than one term. And Johnson, like Mr. Trump, was impeached. President Biden, who attended that inauguration as the former vice president four years ago, took his own oath of office on Wednesday. But Mr. Trump was absent. And while that decision was a break from the norm, it is not without precedent: A handful of American presidents have also missed the inaugurations of their successors.
