Dec. 31 (UPI) -- Bulgaria will begin using the euro as its currency on Thursday, and the country hopes it will bring an economic boost, despite concerns.

Bulgaria joined the European Union in 2007, but it's only now adopting the currency after strong debate and political turbulence.

It's the 21st country to join the eurozone, and lawmakers in Brussels and Sofia hope it will boost the economy of the EU's poorest nation.

European Commission President Ursula von der Leyen called the move one of the EU's greatest achievements.

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