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The internationally unrecognised Rhodesia abolished their monarchy and declared themselves a republic.

Historical image related to The internationally unrecognised Rhodesia abolished their monarchy and declared themselves a republic. from March 2, 1970

Rhodesia

Unrecognised state in Southern Africa (1965–1979)

Rhodesia, officially the Republic of Rhodesia from 1970, was an unrecognised state in Southern Africa that existed from 1965 to 1979. Rhodesia served as the de facto successor state to the British colony of Southern Rhodesia following a unilateral declaration of independence…
Source: Wikipedia (CC BY-SA)

Queen of Rhodesia

Former unrecognised constitutional monarchy

Queen of Rhodesia was the title asserted for Elizabeth II as Rhodesia's constitutional monarch following the country's Unilateral Declaration of Independence from the United Kingdom. However, the position only existed under the Rhodesian constitution of 1965 and remained…
Source: Wikipedia (CC BY-SA)