Which of the following West African countries operated a federal constitution at independence?

Nigeria is the West African country that operated a federal constitution at independence. A federal constitution is a system of government in which power is shared between a central government and constituent political units, such as states or provinces. At independence, Nigeria was divided into three regions, each with its own regional government and legislature. The federal government also had its own central government and legislature. The federal system allowed for a measure of autonomy and self-rule for the regions, while still maintaining a central government for national issues.