Victor Davis Hanson quote: “[T]he Confederacy was so entwined with the idea of preserving slavery that the flag, even today, can evoke racial polar…”

“Shoot down the Confederacy and uphold the flag; the American flag.”

Frederick Douglass (1818–1895) American social reformer, orator, writer and statesman

1860s, What the Black Man Wants (1865)

“Slavery was at the root of what the Civil War was all about. If there had been no slavery, there would have been no war, and that ultimately what the Confederacy was fighting for was to preserve a nation based on a social system that incorporated slavery. Had that not been the case, there would have been no war. That's an issue that a lot of Southern whites today find hard to accept.”

James M. McPherson (1936) American historian

James M. McPherson "James McPherson: What They Fought For, 1861–1865" https://web.archive.org/web/20160309201904/http://www.booknotes.org/FullPage.aspx?SID=55946-1 (22 May 1994), Booknotes, United States of America: National Cable Satellite Corporation
1990s

“Mosby, Rhett, Davis, Stephens, and other Confederates had no difficulty conceding what their descendants go to enormous lengths to deny, that the raison d'être of the Confederacy was the defense of slavery. It follows that, as the paramount symbol of the Confederate nation and as the flag of the armies that kept the nation alive, the St. Andrew's cross is inherently associated with slavery. This conclusion is valid whether or not secession was constitutional. It is valid whether or not most southern soldiers consciously fought to preserve slavery. It is valid even though racism and segregation prevailed among nineteenth-century white northerners.”

Jefferson Davis (1808–1889) President of the Confederate States of America

John M. Coski, The Confederate Battle Flag: America's Most Embattled Emblem https://archive.is/jcaoZ (2006).

“The Confederacy stands for slavery and the Union for freedom.”

Abraham Lincoln (1809–1865) 16th President of the United States

Private conversation https://books.google.com/books?id=cpLsLWYhMLoC&printsec=frontcover&dq=%22not+a+man+shall+be+a+slave%22+%22Mcpherson%22&hl=en&sa=X&ved=0CC0Q6AEwAzgKahUKEwjiwOnYqoLIAhUIez4KHaTnDok#v=onepage&q=slavery&f=false (January 1862)
1860s