Question

which
Northern European countries were
members of the European Union?

Answer 1

Answer:

According to the United Nations, Northern European countries are Denmark, Estonia, Finland, Iceland, Ireland, Latvia, Lithuania, Norway, Sweden and the United Kingdom.

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Answer 2

Answer:

Denmark, Estonia, Finland, Iceland, Ireland, Latvia, Lithuania, Norway, Sweden and the United Kingdom.

Explanation:

The  United Kingdom just left the European Union but i don't know if you wanna include it or not