There are some disagreements about why President Lincoln and the Northerners were willing to fight a war to save the country instead of letting the South secede peacefully. It may have been because the United States was largely seen as a political experiment and they didn't want to see it fail.
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The original goal of the union was to preserve the union at all cost.
President Lincoln's main goal was to preserve and restore the Union, which was his central sworn duty as President. Although he also wished very much to see the end of slavery, he only pursued that goal when it aligned with the one of restoring the Union.
To prevent the south from seceding from the north.
South Carolina's assault on Fort Sumter
Georgia wanted to secede from the Union because they believed Abraham's Lincolns election, and republican party's were strongly and aggressively anti-slavery.