On September 18, 1956, the date for Gold Coast's independence was announced

The Gold Coast is to become the first black African nation to be granted independence from Britain.

On September 18, 1956, in a statement to the House of Commons, Colonial Secretary Alan Lennox-Boyd said the Gold Coast will be allowed to govern itself within the Commonwealth provided a general election is held in the country.

For more information: http://hansard.millbanksystems.com/lords/1957/jan/24/ghana-independence-bill