McGhee writes a powerful book that reveals the irrational believe many have that human rights exist in a zero-sum game dynamic (meaning that if we treat the "have nots" with dignity and justice, than the "haves" will lose rights and wealth). First, we should create just laws and policies, but, second, the harm targeted to people of color ends up harming poor whites and often middle class whites as well. In other words, racist views and the resulting policies and laws hurst everyone. Racism is irrational and harms everyone.
The cover of the book depicts a pool. One of the chapters describes how pools funded by tax dollars denied Blacks entry. When laws required cities to desegregate pools, many cities created private clubs for the use of those pools or closed down the pools rather than have integrated swimming.
The book also explains red lining, voter suppression, predatory subprime mortgages and many other examples of policies intended to suppress the rights and wealth building of Black people (and Lantinx people and non-European immigrants), which is bad enough but also ends up harming more than the intended target.
McGhee talks about breaking down and crying on a couple of occasion because of the mean-spirited, unfair, and devastating outcomes of unjust laws and policies that harm generations of people of all colors. For example, the south has a very low ratio of population to hospitals and to schools, all dating back to the economies of slave-owning plantation owners, who saw no (economic) reason for investing in public services since they did not need educated or healthy people of any color to help them run their big plantations. They preferred to just get more free or cheap labor rather than to invest in the overall wellness (of mind and body) of people in their community outside of the wealthy landowners who had private schools and private healthcare.
It's astonishing how greedy people can be and how they create rationalizations (they are children, they are animals, they are vermin) to support their wealth with unjust laws and policies.
If I were teaching a middle school class or high school class--or a 100-level university class--on American history, I would assign this book.