Quick: Where are “idiots” not allowed to vote? Plus 49 other odd, outrageous, or revealing tidbits about America's 50 states.

The Southern states include both sprawling farmlands and bustling cities. Often called "the South," this area played a pivotal role in shaping the identity of the United States.

Dateline producer Marianne O'Donnell reflects on what it was like to cover the 2017 murders of Abby Williams and Libby German in Delphi, Indiana, and the trial that followed nearly seven years later.