5 countries that have no official national currency

Several countries around the world do not issue or use a currency of their own, instead relying on the money of another country or adopting a widely recognised currency such as the US dollar or euro.
Countries may choose this arrangement for different reasons, including economic stability, stronger trade links, financial crises and close relationships with neighbouring economies.
While using a foreign currency can provide greater monetary stability, it also means these countries have limited control over their monetary policy.
Here are five countries that do not have their own national currency:
El Salvador
El Salvador adopted the US dollar as legal tender in 2001, replacing its...