What country is Haile Selassie I a citizen of?

Ethiopian Empire is the country of citizenship for Haile Selassie I.
The Ethiopian Empire, also formerly known by the exonym Abyssinia, or just simply known as Ethiopia, was an empire that historically spanned the geographical area of present-day Ethiopia and Eritrea from the establishment of the Solomonic dynasty by Yekuno Amlak approximately in 1270 until the 1974 coup d'etat of Emperor Haile Selassie by the Derg.