According to nationalists, a nation-state’s government should be

chosen by that nation-state.

Explanation:

A nation state is a state in which most people deliberately share the same cultural values. Actually, nationalism encouraged people with a shared identity to  separate themselves from those who were not like them. As a result, in a nation-state, most people share the same religion.

chosen by the nation state

Explanation:

Nationalism is the ideology that a nation is ideal for polity and each should govern itself. The nationalists believe that a nation should be free from outside control. A nation has a national identity that takes the legitimacy of from the common language, culture or ethnicity. They favor a particular group of people who finds have a common national identity.

currancy

explanation:

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