Every nation (I think) has stories it likes to tell about itself, its history. Sometimes these myths are relatively harmless, or tolerably accurate.
Australians like (or liked?) to think of themselves as coming from ‘larrikin’ stock, with a streak of rebellion and unconventionality (“Crocodile Dundee” tapped into this).
For Americans its the whole ‘land of the free and home of the brave” (though of course many many Americans, especially if their ancestors had been on the pointy end of that freedom and bravery, as slaves, as Native Americans) know much better.
For Brits it’s the “Dunkirk spirit” and the “Blitz spirit”, the endlessly mythologised ‘British pluck’.
I haven’t read this (paywalled) but it’s probably okay.
https://www.thenewworld.co.uk/brexit-news-the-great-myth-of-british-pluck-and-why-it-s-20318
This is okay