Final answer:
The leaders renamed the country Ghana when the British colony of Gold Coast gained independence. Kwame Nkrumah played a significant role in Ghana's independence movement and became the country's first prime minister.
Step-by-step explanation:
When the British colony of Gold Coast gained its independence, the leaders renamed the country Ghana. The independence of Ghana in 1957 marked it as the first country in Sub-Saharan Africa to gain independence from European colonial powers. The leader of the independence movement, Kwame Nkrumah, became Ghana's first prime minister and played a significant role in shaping the country's post-independence political structure.