She was born the 20th child in a family that had lived in the Mississippi Delta for generations, first as enslaved people and then as sharecroppers. She left school at 12 to pick cotton, as those before her had done, in a world in which white supremacy was an unassailable citadel. She was subjected without her consent to an operation that deprived her of children. And she was denied the most basic of all rights in America--the right to cast a ballot--in...