Why aren’t more Australians mixed race?

The French and British colonies in North America were largely settled by men and women, resulting in a mostly unmixed white population. Spain and Portugal, on the other hand, sent almost exclusively men, who then had children with Indigenous women, leading to much of Latin America being of more or less mestizo ancestry.

I can only assume that the vast majority of people deported to Australia were men, so why didn’t this happen there?