Both the United States and Australia were once a British colony. However, this right pair of fellow sufferers had embarked on completely different paths of development two hundred years later: the United States had become the world pole, Australia had entered the ranks of developed countries, but in terms of the economic, financial and educational fields, there was a big gap between the two countries. I think that the choice of political system is crucial to the country's development. The U.S.A and Australia chose the different political systems, so they took the different directions: the United States opted for a democratic republic that was advanced and made bold innovations, eventually the U.S.A. become a superpower. Australia followed the British monarchy that was relatively speaking more conservative than Republic, and along with the development of history, ultimately Australia widened the gap with the U.S.A.
This paper consists of three parts. The first part is a brief introduction on the polities of the two countries, including their respective forms of government, structures, the state organs of power, the organizations and activities of political parties and introduction of the electoral system. The second part analyzes the causes of two countries choosing their own political system. I think the nature of the two first settlers decided the choices of their respective political system. The first settlers in United States were mainly puritans who were bold and innovative, they wanted freedom and democracy. At the same time, they had the courage to resist imperial power, so they chose a political theory of Montesquieuthe separation of powers to suppress imperial power; finally they developed their own political system in line with the country's practical situation. While the initial migration in Australia was mainly the British exiled offenders. In essence, these people were directly controlled by the British government, they had no