
This undated handout image provided by the Library of Congress shows a letter written by Mary Todd Lincoln to Julia Ann Sprigg, May 29, 1862, which is part of an exhibit at the Library of Congress of letters and diaries saved for 150 years from those who lived through the Civil War that offer a new glimpse at the arguments that split the nation. The Library of Congress holds the largest collection of Civil War documents. It has pulled 200 items from its holdings for a new exhibit to reveal both private and public thoughts from dozens of famous and ordinary citizens who lived in the North and the South. (AP Photo/Library of Congress)

This undated handout image provided by the Library of Congress shows a letter written by Mary Todd Lincoln to Julia Ann Sprigg, May 29, 1862, which is part of an exhibit at the Library of Congress of letters and diaries saved for 150 years from those who lived through the Civil War that offer a new glimpse at the arguments that split the nation. The Library of Congress holds the largest collection of Civil War documents. It has pulled 200 items from its holdings for a new exhibit to reveal both private and public thoughts from dozens of famous and ordinary citizens who lived in the North and the South. (AP Photo/Library of Congress)

Mary Todd Lincoln's three-piece purple velvet ensemble is thought to have been made by black dressmaker Elizabeth Keckley. Mrs. Lincoln is shown as an influential anti-slavery advocate who supported Union troops. (Photo courtesy Smithsonial National Museum of American History)

First Lady Mary Todd Lincoln (Library of Congress)