Going by the description above, the correct answer is European Union.
- This is evident in the fact that currently, European Union has 27 Countries.
- It was created in 1958 with six countries including Belgium, Germany, France, Italy, Luxembourg, and the Netherlands.
- The union is established on treaties, which are willingly and decided through votes by all the countries in the Union.
Hence, in this case, the correct answer is European Union, as it if fits the description in the question perfectly.
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