Sorry, what? If you look at https://en.wikipedia.org/wiki/Politics_of_Australia#Prime_ministers'_parties_by_time_in_office https://en.wikipedia.org/wiki/Politic

Sorry, what? If you look at https://en.wikipedia.org/wiki/Politics_of_Australia#Prime_ministers'_parties_by_time_in_office https://en.wikipedia.org/wiki/Politics_of_Australia#Prime_mi..., you can see that's not the case. https://en.wikipedia.org/wiki/Australian_Labor_Party_split_of_1955 https://en.wikipedia.org/wiki/Australian_Labor_Party_split_o... was a major cause in federal Labor not winning enough seats, and with the demise of the DLP and the rise of explicit faction control, it was possible for Labor to win majorities in the lower house (https://en.wikipedia.org/wiki/Australian_Labor_Party#Federal_election_results https://en.wikipedia.org/wiki/Australian_Labor_Party#Federal... links to all the relevant elections).