“In 1864, black Union troops were involved in operations against Lee's army outside Richmond and Petersburg, and some of them are taken prisoner. Lee puts them to work on Confederate entrenchments that are in Union free-fire zones. When Grant gets wind of this, he threatens to put Confederate prisoners to work on Union entrenchments under Confederate fire unless Lee pulls out. So Grant was willing to embrace an eye-for-an-eye, tooth-for-a-tooth retaliation policy based upon Confederate treatment of black prisoners. For Grant, it was the color of the uniform, not the skin, that mattered.”

Source: 1880s, Incidents and Anecdotes of the Civil War (1885), p. 317

2015, Why do people believe myths about the Confederacy? Because our textbooks and monuments are wrong (2015)
Context: Neo-Confederates also won western Maryland. In 1913, the United Daughters of the Confederacy (UDC) put a soldier on a pedestal at the Rockville courthouse. Montgomery County never seceded, of course. While Maryland did send 24,000 men to the Confederate armed forces, it sent 63,000 to the U. S. Army and Navy. Nevertheless, the UDC's monument tells visitors to take the other side: 'To our heroes of Montgomery Co. Maryland / That we through life may not forget to love the Thin Gray Line'. In fact, the Thin Grey Line came through Montgomery and adjoining Frederick counties at least three times, en route to Antietam, Gettysburg and Washington. Lee's army expected to find recruits and help with food, clothing and information. They didn't. Maryland residents greeted Union soldiers as liberators when they came through on the way to Antietam. Recognizing the residents of Frederick as hostile, Confederate cavalry leader Jubal Early demanded and got $300,000 from them lest he burn their town, a sum equal to at least $5,000,000 today. Today, however, Frederick boasts what it calls the 'Maryland Confederate Memorial', and the manager of the Frederick cemetery — filled with Union and Confederate dead — told me in an interview, “Very little is done on the Union side” around Memorial Day. “It’s mostly Confederate.”

On the Irrepressible Conflict (1858)
Context: The Union is a confederation of States. But in another aspect the United States constitute only one nation. Increase of population, which is filling the States out to their very borders, together with a new and extended network of railroads and other avenues, and an internal commerce which daily becomes more intimate, is rapidly bringing the States into a higher and more perfect social unity or consolidation. Thus, these antagonistic systems are continually coming into closer contact, and collision results.
Shall I tell you what this collision means? They who think that it is accidental, unnecessary, the work of interested or fanatical agitators, and therefore ephemeral, mistake the case altogether. It is an irrepressible conflict between opposing and enduring forces, and it means that the United States must and will, sooner or later, become either entirely a slaveholding nation, or entirely a free-labor nation.

Brooks D. Simpson. "Simple Questions" https://cwcrossroads.wordpress.com/2015/06/21/simple-questions/ (21 June 2015), Crossroads, WordPress
2010s

Andy Hall, "We have received provocation enough..." http://deadconfederates.com/2013/07/01/we-have-received-provocation-enough/ (1 July 2013), Dead Confederates: A Civil War Era Blog.

2010s, Interview with the Reuters War College (April 2017)

Source: 1990s Lies My Teacher Told Me: Everything Your American History Textbook Got Wrong (1995), 1999, Lies Across America: What American Historic Sites Get Wrong (1999), p. 350
Context: Between 1890 and about 1970, northerners found it less embarrassing to let Dixie tell the story of the cause it lost than to reminisce about the cause they had abandoned. The Civil War had been about something other than states' rights after all. It began as a war to force or prevent the breakup of the United States. As it ground on it became a struggle to end slavery. At Gettysburg in the fall of 1863, Abraham Lincoln was already proclaiming 'a new birth of freedom', black freedom. Conversely, on their way to and from Gettysburg, Lee's troops seized scores of free black people in Maryland and Pennsylvania and sent them south into slavery. This was in keeping with Confederate national policy, which virtually re-enslaved free people of color into work gangs on earthworks throughout the south.

North & South Magazine http://thecivilwarhomepagediscussion2824.yuku.com/forum/getrefs/id/16744/type/0 (January 2008), Vol. 10, No. 4, p. 59
2000s

1900s
Context: The Colonies are prepared to meet us. In return for a very moderate preference they will give us a substantial advantage. They will give us, in the first place— I believe they will reserve to us the trade which we already enjoy. They will arrange for tariffs in the future in order not to start industries in competition with those which are already in existence in the mother country... But they will do a great deal more for you. This is certain. Not only will they enable you to retain the trade which you have, but they are ready to give you preference to all the trade which is now done with them by foreign competitors... We must either draw closer together or we shall drift apart... It is, I believe, absolutely impossible for you to maintain in the long run your present loose and indefinable relations and preserve these Colonies parts of the Empire... Can we invent a tie which must be a practical one, which will prevent separation... I say that it is only by commercial union, reciprocal preference, that you can lay the foundations of the confederation of the Empire to which we all look forward as a brilliant possibility.

Speech in Glasgow (6 October 1903), quoted in The Times (7 October 1903), p. 4.