What is the official language of australia?

it's actually English, cos like, there was a time where Britain was likeeverywhere, which is where the phrase, "The sun will never set on the English Empire" cos, they had conquered like...everyone, so that might answer why it's English, or they just speak English cos of their ancestors but tht's just a theory

answer; i believe the correct answer is (fluctuated);

i think the answer to your question is: settlement of the interior and economic growth. ( ^_^)／