This is a very good, opinionated book, discussing recent historiography debates between the western led "New Qing" school, and Chinese academia. The former de-emphasises the importance and continuity of the Unified Chinese state. Their name comes from the breakthrough that the Qing dynasty kept its Manchurian traditions while ruling China, which China does not fully acknowledge today. This school writes history through the prism of the various peoples of China, not of the state itself; an example, would be Bill Hayton's The Invention of China. Ge Zhaoguang, in an effort against this school, defends the importance of studying China through the lens of the State, arguing that all dynasties recognised "China" as some sort of entity that existed and that ruled a certain area. In this effort, he tries to answer the titular question: What is China?
The book is wide in its scope, and although it is far too short to delve into any topic with great detail, it does a good job of summarising each one quite well, with the appropriate caveats and nuance. It recounts how China transitioned from a "Mandate from Heaven", where China at the center had the right and power to govern the entire world, even if the extremities were not worth the effort; to a "one state among many" approach, starting from Matteo Ricci's travels, or perhaps even before, during the time where the Song and Liao dynasties recognised each first as another dynasty of the same Kingdom, and then as rulers of a different one. The other great question is how China is or ought to be composed of: a federation of one "Han" nation leading the others (the "54 minorities", or as the book papers over, the "4 barbarians"); or one state of many nations unified by a nation-less unique " Chinese Culture".
It has two main faults in my view. First, it is extraordinarily self-centred, at times it seems deliberately ignoring that China is not alone in most of these issues. It talks of how China uniquely had well-defined borders before Europe, when Portugal, the country from which I am from, has had virtually unchanged borders for hundreds of years. It also talks about how China alone is hardly a unified nation-state, which is even more common: Spain, Belgium, and even the US do not have a single national "people", or at least some would argue they do not. None of this is discussed: the author takes a modern unified singular "nation-state" to be a real characterisation of all or most countries today, and China alone as the outlier.
Secondly, the book is mostly betrayed by its last chapter and ultimate conclusion, which is an explicit answer to Huntington's Clash of Civilisations. Huntington today is not particularly well-liked in the literature, from what I gather, and its rhetoric is frequently assumed to be simplistic and unhelpful. Given that two major themes of this book is that "All History is Political" and that Chinese historiography has frequently bypassed scientific norms of questioning to answer to the West's and Japan's vision of China, one can't help but ask how much of this book might not fall for the same trap, in particular answering a simplistic take which does not reflect modern Western visions of China.
It is, regardless, a worthwhile read.