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The United States is not just a country, but a multi-ethnic country. A large number of immigrants poured in, including Europeans, Africans and Asians. Therefore, the United States is called a "melting pot", and various races are integrated into one culture. Recently, Americans have been called "salad" because people of different races and nationalities live in harmony, but at the same time they maintain different cultures and customs.

Until the middle of the19th century, the slave issue has been the focus of American political, economic and cultural life. Plantation owners in the south need a lot of labor to cultivate and regard slaves as their property. In the north, with the development of industry, the demand for free labor is increasing. In addition, northerners need low tariff barriers and require the government to invest in the construction of railways and highways, but southerners strongly oppose and advocate free trade in order to buy cheap goods from foreign countries. The accumulation of contradictions led to the division between the north and the south, which eventually led to civil war.