I think peaceful secession laws should be codified internationally, it is ridiculous that people still need to take to violence in order to split a first world

I think peaceful secession laws should be codified internationally, it is ridiculous that people still need to take to violence in order to split a first world country since the act is illegal. As for size, many of the best places to live have around 5-10 million people, so I don't see any harm in splitting out populations of that size. For example, I don't believe that Norway would be better off today if they were forbidden from splitting from Sweden 100 years ago. Note that Norway hadn't been an independent country for 500 years at that point, so their situation was very similar to current Catalonia.