Politically , it will ignite the debate about whether the European dream , and the euro , can survive , and if it should have even been created in the first place . The Treaty of Maastricht which enabled the euro 's adoption was signed in 1999 . The euro was available as currency by 2001 . It is used over the eurozone 's member countries . But it is under threat due to the eurozone 's debt crisis .
The Treaty of Maastricht which enabled the euro 's adoption was signed in 1999 . The euro was available as currency by 2001 . It is used over the eurozone 's member countries . But it is under threat due to the eurozone 's debt crisis .