What happens there is, first and foremost, an issue within Spain, and the region of Catalonia. As such, as an American, it's not my business in any primary sense.
Globalism, on the other hand, I might say this, as these are the thoughts the word itself brings to my mind. So far as I know, this is the only planet mankind inhabits. And, figuratively speaking, it has gotten smaller via the transportation revolution of the last hundred plus years, and via the present day communication revolution. It has also become smaller, in a sense, via the modern day population explosion.
There also exist global-wide problems that all of humanity faces. And, sooner or later, we will have to face those problems as a species of life on this planet, and not simply as national groups.
Take for instance the very real possibility that life overall, on this, our only planet, is entering, or already has entered, the 6th major extinction event. Consider this recent decades long study from Germany, denoting a 77% reduction in flying insects, which pollinate our crops:
https://www.theatlantic.com/science/archive/2017/10/oh-no/543390/
That's a serious issue, one of many that likely should be addressed by a humanity united to address the problems that are truly global in nature. So, from that perspective, I have no problem whatsoever being a globalist in temperament and outlook. Our fragile planet faces a number of problems that should cause us to recognize we should address these problems as the only species on Earth capable of mitigating them, if that is possible.