When you can drive for more than a week straight and still be in the same country, needing to know other languages is a lower priority.
Also when you genocided the indigenous people so hard you never needed to adopt any loan words from the native language.
I have come to realize that largely, in the western world, it’s most common that people speak their own language and English. It just so happens that is the same language for many people.
It’s an Anglosphere problem
It’s called the Crackerverse actually.
Legit though, nobody alive today had anything to do with English becoming the trade language. It used to be French, but that went away and English filled in.
Any country where English is the primary language is going to have less people needing a second language for anything other than the general benefits it brings, which aren’t truly necessary.
It isn’t like everyone, everywhere speaks English on top of their first language, nor does everyone speak multiple languages. They do just fine with the dominant language of their country, and there’s nothing wrong with that.
Also, Australians don’t speak English. They speak Cunt :)