I note your weasel-word "maybe", necessary no doubt because most Lost Causers deny the Civil War was "all about" slavery.
Some claim it was "all about" money, others say that "Ape" Lincoln had... well, you know... "manhood issues", sort of like our current President wanting to build a "big beautiful wall".
So you certainly need a "maybe" there, if only to keep other Lost Causers off your case.
But the historical fact is that Lincoln did not in this speech, or anywhere else, ever propose to "start war" to abolish slavery.
In time he did use the Civil War for this purpose, in his words:
“But the historical fact is that Lincoln did not in this speech, or anywhere else, ever propose to “start war” to abolish slavery.”
If what you say is true, we can forever dismiss the notion that Lincoln and the North fought to “free the slaves.”
But fight they did. And probably for a very good reason: they thought it was in their economic and political best self interest.
H. L. Mencken wrote:
“The Gettysburg speech was at once the shortest and the most famous oration in American history...the highest emotion reduced to a few poetical phrases. Lincoln himself never even remotely approached it. It is genuinely stupendous. But let us not forget that it is poetry, not logic; beauty, not sense. Think of the argument in it. Put it into the cold words of every day. The doctrine is simply this: that the Union soldiers who died at Gettysburg sacrificed their lives to the cause of self-determination—that government of the people, by the people, for the people, should not perish from the earth. It is difficult to imagine anything more untrue. The Union soldiers in the battle actually fought against self-determination; it was the Confederates who fought for the right of their people to govern themselves.”