In 1962, James Meredith became a civil rights hero when he enrolled as the first African American student at the University of Mississippi. Four years later, he would make the news again when he reentered Mississippi, on foot. His plan was to walk from Memphis to Jackson, leading a "March Against Fear" that would promote black voter registration and defy the entrenched racism of the region. But on the march's second day, he was shot by a mysterious...