When did football or soccer become popular in Australia?

Answer 1

it became popular after the huge post World War 2 influx of European migrants and 'ten pond" poms!!. it has continued to grow as Immigration from soccer playing nations has continued.

another important factor is that it has become the sporting activity of choice for parents with young children due to its relative low cost and lack of physical contact and ability for mixed teams..boys and girls playing in the same team.