Some very inaccurate things, but overall a very great book
Red hair is a recessive gene, not dominant. This is basic genetics.
Also, it's sometimes very annoying how the author's lack of knowledge of the outside world shines. Most European nations are members of NATO, like the US, with armies and strong economies, summing up that the fate of the world is at the hands of the Americans to the extreme point made in the book is a bit over the top, insensitive to other cultures, and wrong. There are also some movements for the better even in those regions under the Doomer rule, there are advanced Asian countries like Japan and Korea where women are treated poorly, but the society is advanced, then there is Australia and New Zealand... Despite these oversights in the story, where it seems like only the US exists with Europe being useless and then MENA, Pakistan, Russia and India being the Doomer territory, it's a very well written series, I will continue reading,it's not like I can put it down...