Calling the US, UK and Australia "identical cultures" is pretty bad, just because they all speak English? True, they share common history, but they also have so

Calling the US, UK and Australia "identical cultures" is pretty bad, just because they all speak English? True, they share common history, but they also have so many other influences that they're quite different. E.g. Wales, a country in the UK, even has it's own language which is still taught in schools and used officially everywhere.