They don't want to be bound by the terms of the treaty is main reason that some countries, such as Norway and Switzerland, choose not to be members of the European Union (EU).
More about European Union (EU):
27 European nations make up the European Union (EU), an international organisation that sets basic economic, cultural, and security policies. The EU began a major growth into central and eastern Europe in the beginning twenty-first century after being limited to western Europe at first.
The European Coal and Steel Community, which had just six members when it was established in 1950 and included Belgium, France, Germany, Italy, Luxembourg, and the Netherlands, is where the European Union EU had its start. Under the terms of the Rome Treaty, it was renamed the European Community in 1957 after becoming the European Economic Community (EC).
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