Synthesized answer
The provided passage does not contain information about unanswered questions from the book "A History of the English-Speaking Peoples." [1]
Therefore, I cannot answer what questions remain unanswered based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The Great Democracies [A History of the English-Speaking Peoples, Volume Four]. by Winston S. Churchill