The resolution (point 6) what it says is that no other country can invade another and take away territory as it has pressed with Crimea. In no case speaks of a territory can not self-determine. But what sense does point 2 have?

and that ERC has its origins in Terra Lliure, is a joke.

Yes, you’re Spanish and Geographer, but History you know very little. We had kings, and Aragon was given to our King by their King Ramir because he didn’ts trust the Castillian. Seriously, focus on geography and let others explain History. You suck at it!

2. All peoples have the right to self-determination; by virtue of that right they freely determine their political status and freely pursue their economic, social and cultural development.

But in the same resolution:

6. Any attempt aimed at the partial or total disruption of the national unity and the territorial integrity of a country is incompatible with the purposes and principles of the Charter of the United Nations.

7. All States shall observe faithfully and strictly the provisions of the Charter of the United Nations, the Universal Declaration of Human Rights and the present Declaration on the basis of equality, non-interference in the internal affairs of all States, and respect for the sovereign rights of all peoples and their territorial integrity.

Worth mentioning that some members of ERC – the main political party promoting the independency – come from the terrorist organization Terra Lliure (https://en.wikipedia.org/wiki/Terra_Lliure).

Furthermore, no country – or a few number – recognized Catalonia independency and I doubt that any European country would recognize them, as Spain is not Yugoslavia, despite they try to convince the world that Franco is still alive and ruling Spain…

In my opinion, the independency is a maneuver of a few to avoid to declare their wealth to the Spanish Revenue. CiU (now PDeCAT, political party from Catalonia) is so corrupted as PP (political party from Spain).

Finally, I’m surprised of people being socked because of article 155 being applied to Catalonia (in my opinion, it’s necessary at this point, but not desirable) and I didn’t heard anything when UK applied the equivalent (UK does not have a document named such that) to Northern Ireland. No one spoke about HR being violated.

Anyway, just a few reflexions.

Catalonia is NOT in fact a colony of Spain. You only get that view when start reading by the middle of the book.
I am a Spanish Geographer and thus I have a basic knowledge in Spanish History.
Catalonia has NEVER been a country. This fact obviously does not disallow them to become a country in a future.
It all begins with the muslim occupation of the Peninsula. After they arrived up to the Pyrinees the Franks forced them to retreat and created a buffer area called “Marca Hispanica”, and then remained under control of Carolingians until they were allowed to become independent, but they weren’t a single unit. At that time, the Christians started to reconquer the areas previously lost several kingdoms appeared, among them Aragon Crown, in which, through marriage unions (like Petronila and Berenguer in 1137) glued some of these Catalan counties and the Aragon administrative unit, later expanded.
This process continued until the marriage of the Catholic Kings (1469). By then there were 5 kingdoms in the Peninsula: Portugal, Castile, Navarra, Aragon and Granada, and with this marriage Castile and Aragon were united.
You are pointing out an important event (and by that time there was also the Spanish Succession War equally important), but forgetting the context. It is like taking a 400page book and starting by the 200.
Furthermore, the role of the UK in this story is quite residual. What you pointed out was important, but more important was the Spanish War of Succession (also in that century) were the Ancient Aragon Crown lost its institutions after a dynastic war.
I expect your reply and I would politely request you to read a bit more in order to be better informed.
Greetings!