And/or is there any separatist or anti-mainland sentiment that exists?
I have looked on Wikipedia but I feel like those entries can often be limited for information that did not change the politics of a country.
It seems like all countries end up having their own geographic regions that feel like they have their own culture, identity, and have grievances and at least talk about wanting to do away with their government connections. Having your own island feels like it makes a strong case for that.
(I'm not particular about the specific year range, just wondering if these came up in a time period that still has some modernity involved.)