According to Jürgen Osterhammel the extreme suburbization in America and Australia compared to Paris, Vienna,... before 1945 has nothing to do with "cheap land" or an "Anglo preference for single family homes". There is another more important reason->

He openly admits that American/Australian cities were far uglier than European cities like Paris or Budapest at that time but in Australia even the working class could live this petite Bourgeoisie dream of having a single family home. While workers in Paris had to live in Slums