Whose account of the eruption of Mt. Vesuvius helped modern day volcanologists piece together the event?

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful. 

the railroad administration

people vote for representatives who will make decisions on their behalf.