Writing about kingdoms and empires in my last post prompted me to complete this post, which I’ve been thinking about for some time and had actually done a lot of research towards: the division of current-day countries into kingdoms and republics.
Firstly, a few words about empires. Many of the entities we refer to as an empire were never officially called that: the British Empire was headed by the United Kingdom of Great Britain and Ireland, and Queen Victoria and the few kings following her were only ever Empress/Emperor of India.
As far as I can find, the last counties to be officially called empire were:
the Empire of Japan (大日本帝國 Dai Nippon Teikoku or Dai Nihon Teikoku) (1868–1947) (note that the head of state is still called emperor)
the Ethiopian Empire (መንግሥተ ኢትዮጵያ, Mängəstä Ityop’p’ya) (1270-1974), but apparently the literal translation is ‘Government of Ethiopia’
(arguably) the Imperial State of Persia/Iran (کشور شاهنشاهی ایران Kešvar-e Šâhanšâhi-ye Irân) (1925/1935-11 February 1979)
the Central African Empire (Empire centrafricain) (1976- 21 September 1979).
(Obviously, the scope of an empire varies over time.)