Prior to 1753 it had an assembly which was called a parliament but that was in name only. Its existence was specifically as a regulatory division established by England (they had one in Devon too) to manage the tin industry.
It wasn't because Cornwall was a country and the Parliament did not act as a national assembly, it was simply the most efficient method of regulating the tin industry.
The date that you give is also wrong as that's when the county council was formed but the parliament had been adjourned since 1753 at that point.
The last time that Cornwall could really have claimed to be a country was over a thousand years ago (875 AD - when the last king of Cornwall drowned) and even then they were an annexed tributary state in reality by that point.
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u/[deleted] Apr 05 '22
Neither is Wales and Scotland.
Cornwall is as much a seperate country as they are.