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Here you have a hint of the indoctrination: https://www.nytimes.com/2017/10/29/world/europe/spain-catalo...

“We are not even allowed to wear a bracelet to school with the Spanish flag’s colors, but you can wear one with the independence colors,” Ms. Camina said.

Ollala de Mora, 16, said: “People in school are really against Spain. Our teachers try to influence us. They say the Spain steals from us and the government is bad. If you think differently from that, they try to change your mind.”

That is indoctrination, and there are constant examples of this in daily life for decades. Only the thought of hating Spain is encourage, and less often the thought of coexistence. No wonder that things are like they are now.

And NY Times is one the biased media I see, clearing the supporting more the Catalonian side.