A History of the Roman World from 146 to 30 B.C. (1963) analyses the workings of the Roman constitution alongside looking at the events in Roman history from the time of the Gracchi to the death of Antony. It shows that the supremacy of the senate was based on a well-organised political machine, and that the economic, social and political changes which resulted from the conquest of the Mediterranean world weakened the senate's control without providing a substitute, and so led to the fall of the Republic.