The political struggle caused by extreme ideas and globalization is a major turning point in American politics. The Democratic Party won a resounding victory in the presidential and congressional elections and basically had an advantage in all fields of ideology, which caused a sudden change in the political situation in the United States. Although the constitutional mechanism of the United States can still solve general political crises, it is undeniable that the country's ideological polarization has reached an irreconcilable point. As the world's superpower, the United States has been promoting the process of economic globalization, but the development of economic globalization has made the decline of the United States' power around the world obvious, and domestic politics has experienced unprecedented turmoil. The huge changes in U. S. Domestic politics and the ebb and flow of Sino-U. S. Relations will lead the world to present a new geopolitical map.