The causes of racial discrimination in the United States are rooted in the American system itself. As a colonial political power emerging from the modern world, the basic framework of constructing a "state" in the United States is in fierce conflict with the development and cultural diversity needs of various nations in the era of economic globalization. In his book Who Are We? The Challenges to American National Identity, Huntington, an American scholar who proposed the Theory of "Clash of Civilizations", said that the United States established at the peak of Western colonialism essentially had "Anglo Protestant culture" as the character and core of its "national identity". Therefore, although the CONSTITUTION of the United States flaunts "freedom and equality", these values must be built on the basis of the social form with the above race and religion as the main body, namely the so-called "mainstream society". Any person who is different will be regarded by the elites of the American society as "not my kind and his or her heart must be different".