protectorate, colony
A group of countries ruled by one other country is an empire
A colony
Ireland is independent, so it is not ruled by any other country. Northern Ireland, which is different to Ireland and may be what you are referring to, is part of the United Kingdom.
When a group of countries is ruled by one other country, it is often referred to as a "colony" or a "colonial empire." In this context, the ruling country exerts control over the political, economic, and social systems of the subordinate nations. This relationship can involve direct governance or indirect control through local leaders or systems. The term "imperialism" is also used to describe the broader practice of extending a nation's authority over other countries or regions.
Countries are not ruled by other countries. The answer is none, nor does Spain have colonies..
Britain is the only foreign country to have ruled South Africa.
Now they are not similar but previously both were king ruled country
a
A colony.
different countries are ruled by different people. some countries are ruled by the queen, king, government and even the military. for example, Zimbabwe is effectivley ruled by the military.
democracy
When many lands are ruled by one country, it is called an empire.More then likely, that is called an empire. It could also be called a Kingdom