Former US President Donald Trump recently said that he would announce an important news next Tuesday. Most people believe that he will then announce his candidacy for the 2024 American election. Trump chose to send this signal before the mid-term elections in the United States, apparently in order to cheer the Republican Party and prepare for its comeback. Of course, it also shows that the former president who never lost is still very attractive. At least, his long-term honed political sensitivity tells him that his "charm" has not weakened. Although the recent American public opinion survey shows that Trump's support rate in the Republican Party has a downward trend, once the Democratic Party loses in this mid-term election, Trump's popularity may be re ignited. As an outsider, the Chinese don't really care which party will win the mid-term election, but Trump's appearance on the stage will obviously increase the drama of American politics in the next two years. In the history of American elections, the only example of re-election after a defeat is the Democratic personality of Rover Cleveland. He lost in 1888 for re-election, but won again in 1892. The difference is that Trump did not admit defeat at all, and he always believed that he was the leader who could make "America great again". The extreme differences between American society and the two parties have not been bridged because of his resignation, but are deepening. Trump is one of the results of political polarization and also the cause of deeper political division. Of course, Trump himself may become the victim of this political split. These days, the competition between the Democratic Party and the Republican Party has entered a white hot stage. Both parties regard the mid-term elections as a "major battle" that will determine the fate of the country. President Joe Biden warned voters that American democracy was in danger, while Trump warned voters that more Democratic policies would soon turn the United States into Cuba or Venezuela. Republicans were determined to "ensure that the United States will never become a socialist country." Elections in the United States are no longer simply a choice between the policies of the two parties. Although voters still attach importance to specific policy directions such as abortion and gun control, the elites of both parties try their best to guide voters to regard the election as a "battle of lines". Is the nature and system of the United States really at a watershed moment? The exaggeration and exaggeration of the importance of elections by the two parties not only reflect the profound differences in American society, but also reflect the growing fundamentalism in American political psychology. These two factors affect each other. The political system of the United States is not a passive participant in this division, but also a maker of it. Francis Fukuyama, an American political scientist, wrote in an article published in Foreign Affairs in September/October 2014 that the problems of American politics today stem from the basic design of American political institutions and are exacerbated by increasingly hostile polarization. Such differences are profoundly affecting the social life of Americans, just like two rival religions in a fierce struggle. Each party believes that the other party is "non-native", has a strong sense of disgust and distrust of the other party, and even believes that