<Tr> <Th> Basic forms of government </Th> </Tr> <Tr> <Th> Power structure </Th> </Tr> <Tr> <Td> <Table> <Tr> <Th> Separation </Th> </Tr> <Tr> <Td> <Ul> <Li> Associated state </Li> <Li> Dominion </Li> <Li> Chiefdom </Li> </Ul> </Td> </Tr> <Tr> <Th> Federalism </Th> </Tr> <Tr> <Td> <Ul> <Li> Federation </Li> <Li> Confederation </Li> <Li> Devolution </Li> </Ul> </Td> </Tr> <Tr> <Th> Integration </Th> </Tr> <Tr> <Td> <Ul> <Li> Empire </Li> <Li> Hegemony </Li> <Li> Unitary state </Li> </Ul> </Td> </Tr> <Tr> <Th> Administrative division </Th> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Th> Separation </Th> </Tr> <Tr> <Td> <Ul> <Li> Associated state </Li> <Li> Dominion </Li> <Li> Chiefdom </Li> </Ul> </Td> </Tr> <Tr> <Th> Federalism </Th> </Tr> <Tr> <Td> <Ul> <Li> Federation </Li> <Li> Confederation </Li> <Li> Devolution </Li> </Ul> </Td> </Tr> <Tr> <Th> Integration </Th> </Tr> <Tr> <Td> <Ul> <Li> Empire </Li> <Li> Hegemony </Li> <Li> Unitary state </Li> </Ul> </Td> </Tr> <Tr> <Th> Administrative division </Th> </Tr> </Table>

Why would it help the empire to have only a few rulers who ruled for long periods of time