African-American writer Haley based this book on the oral stories of his family history, handed down to him as a child by his grandmother, who was part of a chain of family memory-keepers going back to the 18th century, to (and even before) the arrival of their ancestor Kunta Kinte in this country as a kidnapped slave. As an adult, Haley painstakingly researched the historical written records to confirm and amplify these stories, even traveling to West Africa, where a griot --a keeper of tribal genealogies and lore-- provided information that dovetailed with his family's own accounts. This book, in large measure, is based on that research. For this reason, most libraries (including the one where I work) have followed the Library of Congress in classifying and shelving it as nonfiction history. That's not, however, an accurate label. The author makes liberal use, in the accounts of the earlier generations, of imaginative reconstructions, invented dialogue, and ascriptions to various characters of unattested thoughts and motives. These devices are dropped in the much shorter accounts of the later generations, beginning with his grandparents (he was born in 1921), which read more like, and actually are, conventional nonfiction.) But the earlier generations take up the vast majority of the book; so I've classified it accordingly as historical fiction.
However, that's in no way said in derogation. This is an exceptionally well-researched and historically grounded novel about actual people; the way Haley creatively fleshes out and envisions the narrative with the techniques of fiction is a superlative example of the way historical novelists should ply their craft. All of the major events of the plot are attested real-life events that actually happened, and what's reconstructed is true to life. In writing dialogue, like other Realist writers before him, Haley also reproduces the authentic dialect of Southern black (and white) speech. He does not do this in any way to ridicule or put down the speakers, but to express the truth that black dialect is no disgrace to be ashamed of; it's as legitimate a regional/sub-cultural adaptation of the English language as any that ever developed among regional and sub-cultural groups of white people.
Most of the recounted historical experiences were in, and shaped by, the cultural context of slavery, and later segregation. No punches are pulled in accurately bringing to life the unconscionable way the slaves were exploited, the vile injustices and outrages they had to put up with as a matter of course, the racism and discrimination they suffered from even after slavery's end. The overall effect of this, seen through black eyes, is extremely powerful; and indeed this book, and the TV miniseries adaptation (which actually doesn't follow the book very closely in the later generations) was probably the single major cultural influence, in the later 20th century, that actually made much of the white community think seriously about that aspect of the American black experience. But, to Haley's credit, this isn't a pity-party that invites both blacks and whites to see the former as helpless perpetual victims. His ancestors weren't people who let themselves be defined as victims. The book as a whole is a testament to black courage, self-reliance and self-help, determination to forge a culture and a way of life in spite of hindrances, and to the strength of the black family. (He also doesn't demonize all whites as such.) As a practicing Christian himself, the author is also sympathetic in his treatment of the black church. (Kunta Kinte was a Moslem; but he married a Christian, and she raised their daughter as one.) The subtitle says it all: The Saga of an American Family. This family is as American, as much a part of the American fabric, as any other; they claim that heritage as a right, and they deserve to be recognized and treated as such as much as any other.
Earlier this year, when I made a list of my 100 top favorite books, this one was on it. Personally, I consider it one book that every American, of whatever race, ought to read.