Presumably because they thought it would be a good idea to join.
Corsica is an island that is part of France, and France is a member of the European Union.
It is owned by France, and is part of the European Union.
The French overseas department of Guyane (or French Guiana) is the only part of South America that is part of the European Union, since it is an integral part of the country of France, who is a member of the European Union.
The Euro. This is mainly because France is now part of the European Union.
Yes. The only major European countries that are not part of the European Union are Norway and Switerland.
Through being an overseas territory of France, it has rights and privileges afforded to it by the European Union.
No. France is an independent sovereign state and is part of the European Union as is the United Kingdom.
Because It is an overseas region of France.
Yes, France was a founding member of the European Union.
France is the largest country in western Europe (Ukraine or the European part of Russia are larger) and the largest one in the European Union.
No. But France is the largest country in the European Union. Russia has the largest European territory. Also Ukraine has a larger area than the European part of France. Should non European territories be counted, then Norway, Denmark and Kazakhstan are larger than France, too.
They are four separate countries but are all part of the European Union.