He recommended that a country additionally required an expansive naval force to ensure its vendor transports and to shield its entitlement to exchange with different nations. Alfred T. Mahan an officer in the US Navy who instructed at the Naval War school.
By birth? i think? do you mean like how did they get in a certain caste? because then it would be by birth. but if you mean like what were the castes, i forget.
First, take the year that is most recent which in our case is 1973 and then subtract from that 1961 to get 12 years old. Hope this helps!
imagine you are a king/queen and its time for you to step down as reining monarch, your mother and father are your predecesors and therefore your son or daughter would be heir, normally its the first born child