Douglas A. Blackmon is the author of the Pulitzer Prize-winning "Slavery by Another Name: The Re-enslavement of Black Americans from the Civil War to World War II." He teaches at the University of Virginia's Miller Center and is a contributing editor at the Washington Post. Find more images, documents, and a link to the documentary based on "Slavery by Another Name," which will be rebroadcast on PBS on February 22, at www.slaverybyanothername.com.

On July 31, 1903, a letter addressed to President Theodore Roosevelt arrived at the White House. It had been mailed from the town of Bainbridge, Georgia, the prosperous seat of a cotton county perched on the Florida state line.

The sender was a barely literate African American woman named Carrie Kinsey. With little punctuation and few capital letters, she penned the bare facts of the abduction of her fourteen-year-old brother, James Robinson, who a year earlier had been sold into involuntary servitude.

Kinsey had already asked for help from the powerful white people in her world. She knew where her brother had been taken—a vast plantation not far away called Kinderlou. There, hundreds of black men and boys were held in chains and forced to labor in the fields or in one of several factories owned by the McRee family, one of the wealthiest and most powerful in Georgia. No white official in this corner of the state would take an interest in the abduction and enslavement of a black teenager.

Confronted with a world of indifferent white people, Mrs. Kinsey did the only remaining thing she could think of. Newspapers across the country had recently reported on a speech by Roosevelt promising a “square deal” for black Americans. Mrs. Kinsey decided that her only remaining hope was to beg the president of the United States to help her brother....