NSW has two periods of party activity. The first is prior to the 1930s when most governments were minority governments and elections highly competitive. Since the 1930s and the UAP winning the election after Lang's dismissal NSW has seen the increasing party discipline form of government with strong majorities and long electoral success.
The party system as we know it in Australia is Labor's innovation. Prior to Labor's appearance in Australian electoral politics the governments were fluid bodies of coalitions who would often form around a strong leader. Because of the pledge and Labor's discipline to the party's national executive this factional form of organisation was broken.
The Liberals formed in 1904 as a response to Labor and basically out party organised the Protectionists and Ministerialists such that the latter two parties were not electorally competitive. (more)
The party system as we know it in Australia is Labor's innovation. Prior to Labor's appearance in Australian electoral politics the governments were fluid bodies of coalitions who would often form around a strong leader. Because of the pledge and Labor's discipline to the party's national executive this factional form of organisation was broken.
The Liberals formed in 1904 as a response to Labor and basically out party organised the Protectionists and Ministerialists such that the latter two parties were not electorally competitive. (more) 




