Answer:
The Central Idea of the book is: For most nations, the period of Roman Peace (aka Pax Romana) was the most prosperous time in human history, whereby there is absent of any significant conflict or fighting prior to recent times.
Explanation:
The Book, Pax Romana: War, Peace, and Conquest in the Roman World, was written by Adrian Goldsworthy, who used the text to illustrates the situation and meanings of Roman Peace: Pax Romana, and thereby elucidates various methods utilized to rule the huge Roman empire in between the Republic and Emperor's eras.
Hence, the Central Idea of the book is: For most nations, the period of Roman Peace (aka Pax Romana) was the most prosperous time in human history, whereby there is absent of any significant conflict or fighting prior to recent times.
