For the Acemoglu and Robinson’s book; I love how they combined economics, politics, and history in one package. Particularly, the story about 38th parallel makes me curious about what really happen in the North.
And the curiosity leads me to buy Demick’s book. A story about real lives in the North is carefully explained here. No wonder, it got many praises from other reviewers.
In my opinion, they are the most recommended non fiction books to read if you are interested in those subjects.