Why did Ghana became a republic on 1960 but not 1957​

Answer"

1960

Explanation:

Ghana was a dominion within the Commonwealth of Nations between 6 March 1957 and 1 July 1960, before it became the Republic of Ghana. It was the first western African country to achieve independence.

British rule ended in 1957, when the Ghana Independence Act 1957 transformed the British Crown Colony of the Gold Coast into the independent Dominion of Ghana.[1][2] The British monarch remained head of state, and Ghana shared its Sovereign with the other Commonwealth realms. The monarch's constitutional roles were mostly delegated to the Governor-General of Ghana. The following governors-general held office:

Charles Noble Arden-Clarke (6 March – 24 June 1957)

William Francis Hare, 5th Earl of Listowel (24 June 1957 – 1 July 1960)

Kwame Nkrumah held office as prime minister (and head of government). Following the abolition of the monarchy after the 1960 Ghanaian constitutional referendum, Nkrumah won a presidential election and became the first President of Ghana.