Whose bestselling memoir was titled "I Know Why the Caged Bird Sings"?

I Know Why the Caged Bird Sings was the first memoir by Maya Angelou, published in 1969. The autobiography recounts Angelou's childhood and early experiences growing up in the segregated American South. Praised for its powerful storytelling, honesty, and literary style, the book became an international bestseller and is widely regarded as one of the most influential autobiographies of the 20th century. Angelou went on to write several memoirs and became an acclaimed poet, author, educator, and civil rights advocate.