France-Spain

France-Spain (French: France-Espagne, Spanish: Francia-España), officially the United Duchy of France and Spain (French: le Duché Uni de France et Espagne, Spanish: el Ducado Unido de Francia y España) is a union between France and Spain. And Andorra too, of course.

Formation
One day, France and Spain met each other and said "Hey, we have linguistic similarities and good relations, let's unify!" and they did it.

Then, Andorra said "Hey, we're enclaved, can we join too?" and France-Spain said "Sure!".

Plans
With this new country, Spain converted her rails to be the same as France's, so they can unify the railway network as well. This caused Portugal to do the same.

One thing that couldn't be done was France-Spain-Catalonia, where Catalonia would be given the same status as France and Spain.

Another thing was turning France-Spain into a great Pan-Latin union, so they contacted Italy about the idea.

However, neither France-Spain-Catalonia nor the Pan-Latin State happened since the country died (see below for more info).

Dissolution
12 years after formation, the French and the Spanish started to argue, which caused France-Spain to be dissolved, causing France and Spain (and Andorra) to become separate countries again. They blamed each other for the dissolution. However, France and Spain became friends again some time later.