The United States forced China to sign an unequal treaty after the First Opium War, but the typical example was the "open door" policy at the end of 19. After the Spanish fight for the Philippines ended, the United States began to get its hands on China, but by this time China had been carved up. America's military strength is not comparable to that of Britain and France, but its economic strength is the strongest. The great powers are developing unevenly in politics and economy, and no one can monopolize China. On the one hand, this policy recognizes the vested interests of the great powers in China, on the other hand, it is conducive to their further expansion, so it has been endorsed by the great powers to varying degrees (Baidu can learn the details of the open door policy). The United States has the entire China market as easy as blowing off dust, and can compete with other countries with its strong military strength. Great powers in China unprecedented fierce competition, temporarily achieved a superficial agreement, but also formed a * * * and China were slaughtered together.

After Eight-Nation Alliance invaded China, it signed the "Xin Chou Treaty", and the United States used the boxer indemnity of the Qing government to establish Tsinghua University to develop education.