After the middle period of Jiaqing, the rule of Qing Dynasty declined gradually. At the same time, European and American powers have also made great progress. China has been an agricultural country since ancient times. The self-sufficient natural economy and the conservative thought of "China is the country" have always had little demand for foreign products from China. In order to make huge profits, foreign businessmen smuggled opium into China in large quantities, which led to opium flooding, affected people's physical and mental health, corrupt official management, silver outflow and government revenue shortage. Daoguang appointed Lin Zexu as an imperial envoy and went to Guangdong to ban opium. Thus angered the European and American powers, triggered the Opium War, China's army was defeated, and the cowardly Qing government was forced to sign a series of unequal treaties, such as the treaty of nanking, which led to the humiliating history of China's modern history.

Mexican chronicle

1776 After the United States became independent, it took advantage of the opportunity of European powers to compete for colonies in Africa and Asia and expanded in the North American continent. 1846 in may 13, the us government declared war on Mexico, and the us-Mexico war officially broke out. Declaring war is just a trick to deceive the world, and the American military action has lasted for more than four months before that. The Mexican government could have seized the opportunity to organize a counterattack and turned defeat into victory. But Mexican rulers always compromise. 1848 On February 2, the United States and Mexico signed the humiliating Treaty of Guadalupe Hidalgo. The United States seized nearly half of Mexico's territory, and the United States only paid Mexico $654.38 million+0.5 million as "compensation".

Through the US-Mexico War, the United States became a powerful country across the Atlantic Ocean and the Pacific Ocean, and has since become the master of the United States. Even Grant, a famous American who took part in the war personally, had to admit: "This war is one of the most unjust wars waged by powerful countries against weak countries."