Short answers, pulled from the story.
By 2001, historian Jonathan Sarna estimated there were over 50,000 books on the American Civil War, with roughly 1,500 more appearing every year. Authors James Lincoln Collier and Christopher Collier put the total as high as perhaps a hundred thousand books by 2012.
No complete bibliography of the American Civil War exists. The largest guide to books on the subject is more than fifty years old and lists over 6,000 of the most valuable titles as evaluated by three leading scholars.
A History of American Civil War Literature (2016) was edited by Coleman Hutchison. It emphasizes cultural studies, memory, diaries, southern literary writings, and famous novelists, and serves as the most recent guide to literary and non-military topics in the Civil War bibliography.
Bell Irvin Wiley's The Life of Billy Yank (first published 1952) and The Life of Johnny Reb (first published 1943) are the foundational works on the common Union and Confederate soldier. James M. McPherson's For Cause and Country is another prominent title examining why soldiers chose to fight.
Dudley Taylor Cornish's The Sable Arm (1956, reprinted 1987) was an early scholarly treatment of Black troops in the Union Army. Joseph T. Glatthaar's Forged in Battle examined the alliance between Black soldiers and white officers, and the essays in Hope and Glory focused on the legacy of the 54th Massachusetts Regiment.
Annie Heloise Abel published two foundational studies in 1919 covering American Indian participation in the Civil War. Later works include Kenny A. Franks's Stand Watie and the Agony of the Cherokee Nation and Clarissa W. Confer's The Cherokee Nation in the Civil War.