The archivist stumbled across the file in a stack of boxes on the second floor of the Schomburg Center for Research in Black Culture in Harlem. The yellowing letters inside dated back more than half a century, chronicling the dreams and struggles of a young man in Kenya.

He was ambitious and impetuous, a 22-year-old clerk who could type 75 words a minute and translate English into Swahili. But he had no money for college. So he pounded away on a typewriter in Nairobi, pleading for financial aid from universities and foundations across the Atlantic.

His letters would help change the course of American history.