I would argue that while hostilities and the fighting ended; the Civil War has not ever ended.
Reconstruction was just another phase of the War of Northern Aggression. Then various laws, policies and practices from Fedzilla has carried on the social, cultural and economic divides and here we are today - 150 plus years after the shooting ended - and we are still on the brink of picking up where Appomattox left off.
Also a defensible view.