What argument does lincoln make about the civil war in "the gettysburg address"?

he asserts that the war happened a long time ago, but it is worth remembering.

he states that the war, though filled with great struggle and strife, is a positive experience that will make the nation stronger.

he insists that the war should never have been fought, and he blames the south for starting it.

he claims that the war is about the ideals of the nation, and whether a country founded on those ideals can survive.