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In page Nation state:

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Some of the smaller European states were not so ethnically diverse but were also dynastic states ruled by a royal house. Their territory could expand by royal intermarriage or merge with another state when the dynasty merged. In some parts of Europe, notably Germany, minimal territorial units existed. They were recognized by their neighbours as independent and had their government and laws. Some were ruled by princes or other hereditary rulers; some were governed by bishops or abbots. Because they were so small, however, they had no separate language or culture: the inhabitants shared the language of the surrounding region.[citation needed]