Denmark: History
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Denmark recognizes Iceland's independence.
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Denmark joins NATO.
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Denmark becomes a founding member of the Nordic Council, which is established to further the mutual interests of Scandinavian countries.
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Denmark joins the European Free Trade Association (EFTA).
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Denmark joins the European Economic Community (ECC), which later becomes the European Union.
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Denmark rejects the adoption of the euro. The Danish krone remains the national currency.
Sources:
BBC NewsBritannica