The pedestal contemporary people put national identity on is just that, contemporary. National identities didn't arise naturally. Many of them were very thoughtfully and intentionally invented. For most of human history, the idea that people over a geography the size of Engalnd would see themselves as one people would've been ridiculous.
It's really only in the last 200-400 years that people have accepted the nation as their identifying place. Previously people's place identity came the much smaller geography of their county, kingdom, principality or hamlet. Joining these smaller identities into larger national identities was a big win that came with many benefits. Of course it meant that these places had to give up some autonomy. Just as there are many benefits of nations giving up some autonomy to act collectively in a regional power structure.
It's only our contemporary bias that tells us that the subordination of the political will of the hamlet to the nation is good and that the subordination of the national will to a continental or regional will is bad.
It's really only in the last 200-400 years that people have accepted the nation as their identifying place. Previously people's place identity came the much smaller geography of their county, kingdom, principality or hamlet. Joining these smaller identities into larger national identities was a big win that came with many benefits. Of course it meant that these places had to give up some autonomy. Just as there are many benefits of nations giving up some autonomy to act collectively in a regional power structure.
It's only our contemporary bias that tells us that the subordination of the political will of the hamlet to the nation is good and that the subordination of the national will to a continental or regional will is bad.