The organization of countries that has taken the most extensive measures toward European unity is the

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The European Union (EU) has taken the most extensive measures toward European unity through a variety of initiatives, including the creation of a single market, a common currency (the euro), a common foreign and security policy, and the harmonization of laws and regulations across member countries. The EU has grown from its origins as the European Coal and Steel Community (ECSC) and now includes 27 member states. Other organizations, such as the North Atlantic Treaty Organization (NATO) and the European Free Trade Association (EFTA), have also contributed to European integration but to a lesser extent than the EU.

The Organization of Countries That Has Taken the Most Extensive