What if the South does not secede until Lincoln's second term? This is assuming Lincoln is reelected. Some of the main cast would be a little older, some younger men would play a larger role. Military technology would be a bit more advanced. Both sides would be a little different in terms of industrial development. What about internationally? Russia would not find an American buyer for Alaska in 1967, or would they have sold in the early 60s?
Is this TL possible and would it make any difference?