Roman and British realms (7)
I believe the answer is:
empires
(Other definitions for empires that I've seen before include "Groups of states under one sovereign" , "more than one power base" , "Dominions" , "monarchies" .)
I believe the answer is:
empires
(Other definitions for empires that I've seen before include "Groups of states under one sovereign" , "more than one power base" , "Dominions" , "monarchies" .)