This paper, following the method of systematic balanced thinking, studies nationalism and nation-states amidst globalization, proposing the following main points: First, moving to the center of the world stage, we should correctly understand nationalism and nation-states, and represent the moral, theoretical and technological commanding heights. Second, nationalism is a double-edged sword, the national liberation movement in history was essentially a movement against imperialism, extreme nationalism is the root of world turmoil, and national self-determination and national independence movement is not a fundamental choice for the healthy development of human society. Third, nation-states have universality and particularity of interests, the essence of nation-states is to concentrate national strength to defend national rights and interests, and to maintain social order and the rule of public life. Fourth, the People’s Republic of China and the United States of America are two nation-states with distinctive characteristics in the world. The United States, as the largest emerging nation-state, highlights Protestant culture in its nationality, adheres to power politics and the rule of survival of the fittest, and pays more respect to modern laws and regulations in national governance. China, as the largest ancient nation-state, highlights farming culture in its nationality, adheres to the philosophy of living in harmony with nature, and is greatly influenced by natural forces or traditions in terms of national governance. The cooperation-competition development with “Bipolar Coexistence” of China and the United States results from the law of human social development. Fifth, to cope with the current complex and sensitive international situation, it is necessary to correctly judge and choose the future trend and power of nation-states in the world. The countries in our world are multi-ethnic and multi-religious. Peaceful coexistence, mutual benefit, free choice of residence and mutual respect are the only correct choices for the survival and development of peoples of all ethnic groups around the world. The action and reaction of universality and nationality promote the development process of the Community of Shared Future for Mankind. Sixth, the key to national equality lies in equality of people, and the key to building the Community of Shared Future for Mankind lies in the consciousness of equality, which requires that we adhere to the unity of universality and particularity.