European nations have been unified under various treaties since the end of World War II.
The political system and distribution of power and responsibility in the EU are complex, an inherent difficulty of integration.
Eurozone member states, in dark blue, have officially adopted the euro as their currency.
Member states are shown in dark blue, current candidates in light blue, applicants in green, and potential candidates which have not yet applied are in yellow.
Greece's debt percentage since 1999, compared to the average of the Eurozone
Long-term interest rates among Eurozone countries reflect sovereign debt crises in Greece, Cyprus, Portugal, and others.
Debt profiles of Eurozone member nations
Members and flag of the European Coal and Steel Community, an early and successful attempt at unifying European countries
These opinion poll results reflect a deep public ambivalence toward EU membership in Croatia.
