Alvin Chang:

Think about your elementary school. 

If you attended an American public school, chances are you went to that school because your family lived in that school’s attendance zone. You probably didn’t think twice about it.

We tend to assume these are neutrally drawn, immutable borders. But if you take a step back and look at the demographics of who lives in each attendance zone, you’re faced with maps like this.

Madison recently expanded its least diverse schools, despite space in nearby facilities.