In which year did the Republic of Slovenia formally join both the North Atlantic Treaty Organization (NATO) and the European Union?

Answer and explanation

Correct answer: D. 2004

  1. Step 1: Slovenia joined NATO on 29 March 2004 and the European Union on 1 May 2004 during the EU's fifth enlargement. Answer: 2004. Why not the others: 2007 was the year Slovenia adopted the Euro and entered the Schengen zone, 1992 was UN admission, and 2000 was the year of the Millennium Summit.

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