Synthesized answer
The provided passages do not contain information about what questions remain unanswered in the book "When China Rules the World: The End of the Western World and the Birth of a New Global Order" [1]. Therefore, I cannot answer your question based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: When China Rules the World : The End of the Western World and the Birth of a New Global Order by Martin Jacques