Jackson was born in Aiken, South Carolina, on April 1, 1907, and raised Methodist. At the age of 15 he moved to Harlem, New York, where he enrolled in Stuyvesant High School. During this time, he became interested in African-American history and culture and began writing essays on the subject. They were so impressive that in 1925, while still a high school student, Jackson was invited to write for Marcus Garvey's newspaper, "Negro World." From...