As I was reading this book, the first part seemed like it is full of "white guilt" - expanding the sin of racism to all white people in the USA by virtue of the color of their skin.
After that, Piper explores individual sins on both sides of the issue - "both" because the reality is (at this point, anyway) the big divide seems greatest between African-Americans and Americans of European descent. There is plenty of sin to go around.
When Piper gets into the meat of the topic - WHY it is a sin and why it matters, this is an excellent book. I also broadened to topic to include "favoritism" (not just the race kind) and it became more excellent.
by your blood you ransomed people for God
from every tribe and language and people and nation, (Rev. 5:9)
From chapter 6 on, the book is steeped in the Gospel. We are all created in the image of God - to practice favoritism in any way strikes at the image.
I'm giving this 4 stars (also working on a star system... 😉