Since 2016, the United States has withdrawn from more than a dozen international treaties and organizations. On July 21, 2020, the United States suddenly unilaterally asked China to close its Consulate General in Houston. This outrageous and unreasonable act was surprising. Is this a new sign of the cold war? The international community has paid extensive attention to this issue. The United States has always taken the principle of “the United States first” as its principle to deal with international relations with hegemony. In the process, the international reputation and influence of the United States are declining sharply, and its international status is also at its lowest point. The image of America’s overbearing and isolated self seems to be more deeply rooted in the hearts of the people. From the frequent “retreat” of the United States to the closure of the Chinese Consulate General in Houston, this series of actions always reminds people of the four words “closed door”. No one would have thought that the United States would gradually isolate itself. Under the background of globalization of win-win cooperation, this series of actions also reveals a kind of retrogression signal, and the hegemony status of the United States is declining. The United States closed the Chinese Consulate General in Houston in an attempt to create a “new cold war” against China, or to create tension between China and the United States in an attempt to serve the US election in November. This kind of behavior of the United States has also aroused strong resentment, opposition and concern of people of insight in the international community. On July 25, scholars and activists from 48 countries spontaneously organized a global online open conference on “any new cold war against China is against the interests of mankind”, which was broadcast globally on multiple platforms, calling on the United States to abandon the Cold War mentality. The meeting issued a 14 language joint statement entitled “rejecting the new cold war”, pointing out that the US government’s words and deeds against China are becoming more and more radical, which poses a threat to world peace. Any form of “new cold war” will completely violate the interests of mankind. It supports the establishment of Sino US relations on the basis of mutual dialogue and is committed to human solidarity. Netizens from more than 50 countries and regions watched the global live broadcast, and more than 200 million people read the conference and statement reports, which attracted wide attention from the international community. The closure of the Chinese Consulate General in Houston by the United States is completely unreasonable and is not conducive to the common interests of peaceful development of mankind. In the long run, if the United States blindly takes a series of actions that are not conducive to the common interests of mankind in order to curb China’s development, it will also be detrimental to the development of the United States itself. It will gradually make the United States move from “the United States first” to “the United States second” or even further. At the same time, such unreasonable behavior of the United States is not the national image of a responsible country. The United States can not forget morality and obligations for its own interests. Human beings are a community of shared destiny, and their mutual relations and interdependence are deepening. People of all countries share weal and woe. Any major decision will affect the common development of mankind. This kind of unilateral hegemonic and unreasonable behavior of the United States is totally against the development of the community of shared future of mankind. The cold war has always been people’s aversion, and win-win cooperation is what people pursue. Guan Zi, an ancient Chinese academic work, pointed out that the combination is strong and the isolation is weak. Only communication and cooperation will lead to win-win results. The United States “retreats from the group” and closes the door of communication and exchange, which can only lead itself to recession and isolation. We should strive to build a world that is far away from closed, open and inclusive, rather than trapped in isolation. There is an old Chinese saying: “all things grow together without harming each other, and the Tao is parallel but not contrary.” Mankind is a community of shared destiny, and globalization is the development trend of the times. Only by complying with the development trend of the times and adhering to the spirit of communication and win-win cooperation can we achieve common prosperity and development between China and the United States.