Which of the following countries had practised confederal system of government?

Senegal and The Gambia have practiced a confederal system of government. A confederal system of government is a form of government in which several independent states or regions come together to form a union or confederation. In this system, each state or region retains its sovereignty and has its own government, but they also have a central government that handles issues that affect the entire confederation. Senegal and The Gambia were once two separate countries but decided to form a confederation in 1982. The confederation lasted for seven years, during which both countries maintained their own governments and sovereignty, but shared a central government that handled issues such as defense, foreign affairs, and economic development. However, the confederation was dissolved in 1989 due to tensions between the two countries.