Name the cause
Euphemism is how the Lost Cause won classrooms for a century.
The 14th Amendment's birthright and equal-protection clauses still structure US litigation -- a live legal legacy.
The US Army's professional self-image runs through Grant and Sherman more than through the Indian Wars it also fought.
Lessons
Industry plus politics
Factories without emancipation diplomacy might still have been a longer war.
Victory can be reversed socially
Amendments without enforcement became paper.
Civil wars make memory wars
Statues are arguments in stone.
Disease is a belligerent
Camps killed more than famous charges.
Unresolved
Exact death toll
Still a scholarly range.
Monument landscape
A live municipal and state fight.
School standards
Slavery's centrality is still contested in some US legislatures.
Repair politics
Reparations debates cite this war's unfinished economic ledger.
Shifts
Second founding
13th-15th Amendments as a new constitutional baseline.
Federal power
A war presidency and a larger peacetime state.
Abolition of property in people
The central economic revolution -- without forty acres.
Modern US military seed
A mass-war experience the later world wars would dwarf in the world, not in US deaths.
Outlook
Public history in flux
NPS labels and museum rewrites are the current campaign.
Data revisions
Digitised census work still moves the death band.
A domestic argument
Unlike 1918, this war's meaning is still a US election issue.
Risk
memory conflict
The armies surrendered. The live risk is civic: a civil war taught as romance or as denial can still poison a republic's self-account.
Jim Crow was a counter-revolution. The civil-rights era was a second Reconstruction -- the comparison is standard among historians.
Foreign readers should not mistake battlefield tourism for a settled national story.