What are monaco singapore and vatican city examples of?

City-states

Explanation:

Monaco, Singapore, and Vatican are all examples of city-states. While this type of state was very common in the past, nowadays it is only these three states that officially fall into this category. Monaco is located in Europe, on the Azure coastline. Vatican is also located in Europe, in the central part of the Italian capital Rome. Singapore is located in Asia, connecting the continental and island parts of Southeast Asia. All three are very powerful economically, with Vatican also having big religious and political power, and Singapore being one of the economic leaders in its region.