Lots of people get to high school thinking that the Civil War was about slavery. Then they learn that Lincoln said at the start of the war that his goal was, first and foremost, to preserve the Union. Ah-ha! Lincoln didn't care about freeing the slaves... An easy conclusion to make at a time when you're learning not everything is as it seems.
The writer of this article in the Seattle Times fell into the same trap. I was so happy to read the only comment to his article, obviously from someone who had read through to the end of the Lincoln story. The entire comment is worth reading, but here's an excerpt:
Bravo, rhp6033 from Everett, Washington!