HOW IT STARTED: Police investigating large burning cross at Chicago’s Grant Park.

—Chicago’s ABC affiliate, last Wednesday.

How it’s going:

More details here: Person of interest in Grant Park cross burning incident in custody, police say.

[NBC Chicago’s Chuck Goudie]: “Did you make it all the way through almost four years at UIC without somebody teaching you that a burning cross is one of the most divisive symbols in America?”

[Illinois Chicago senior Merlin Lu]: “No, I don’t really have any, like… I never grew up with religion, never really surrounded myself with people with it. My childhood friend’s they, I remember them going to, like, confirmation and stuff like that, but um…”

Goudie: “But it’s a symbol of the Ku Klux Klan. I mean, that really is where it started. Nobody ever taught you that? You never read it in a history book?”

Lu: “I just saw the Wikipedia page with the movie with the, like, I think it’s called like ‘Under One Nation’ or something like that.”

“The Birth of a Nation” is a famous 1915 silent film that romanticized the KKK and showed a cross burning.

Woodrow Wilson’s favorite movie!