The document provides biographical information on 20 important figures from the American Civil War era, including presidents, generals, politicians, and activists from both the Union and Confederacy. Key figures discussed include Abraham Lincoln and Jefferson Davis as presidents during the war, generals Ulysses S. Grant, Robert E. Lee, Thomas "Stonewall" Jackson, and William Tecumseh Sherman, and abolitionists John Brown, Harriet Beecher Stowe, and Thaddeus Stevens. The document provides brief summaries of each individual's roles and contributions during the Civil War period.