Lots of historic front pages. Sorry to say that the Lincoln assassination front page from The New York Herald is a reprint.
Newspapers in 1865 where printed by a rotary printing presses.
Dead giveaway of this reprint is the gripper marks at the bottom of the page from where the paper is trimmed when it comes off the press. I also suspect that the issue feels more like a modern newspaper (lots of pulp) where an original 1865 newspaper would feel more substantial because of the higher rag content.