12 countries signed the Maastricht Treaty.
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Maastricht
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The members of the European Economic Community signed the Maastricht Treaty in 1992 to create the European Union. The treaty established the European Union as a political and economic union, laying down the foundations for the single currency (the euro) and outlining the common foreign and security policy of member states.
The Maastricht Treaty...
The Treaty of Rome started the European Economic Community, which eventually be came known as the European Union. The Maastricht Treaty was the treaty that formally started the use of the name "European Union". It was signed in Maastricht, which is in the Netherlands.
Maastricht
Maastricht, there's a hint in the name
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The Maastricht Treaty. Not all members of Europe have signed it and still refuse to sign it (ie, UK, Poland, Hungary, etc).