What are the main factors that make the United States an immigrant country?

Since the United States had no feudal foundation, it was able to fully absorb the democratic and liberal ideas of outstanding European thinkers at the beginning of the founding of the People's Republic of China, and it was a relatively free country from the beginning. After that, he avoided the Napoleonic Wars, and was fortunate enough to acquire a large number of French colonies in North America, greatly increasing the land area. After plundering half of Mexico's land, the United States has become a big country that spans North America and faces the sea on both sides. /kloc-in the 0/9th century, Europe became chaotic due to revolution and war, while the United States was relatively stable. Moreover, shortly after the founding of the United States, a large number of laborers were needed for construction, and the discovery of gold mines triggered a gold rush, so Europeans, slaves, Chinese workers and so on poured in.

/kloc-By the end of the 9th century, the United States has become one of the most powerful countries in the world. Free and relaxed political environment, developed and fast-growing economy, vast territory and relatively peaceful domestic atmosphere are all factors that attract a large number of immigrants in the United States.

After entering the 20th century, the situation is similar. The United States continues to develop rapidly, while wars in other parts of the world continue. In the process of development, the United States has accepted countless immigrants from all over the world, and these immigrants have also promoted the development of the United States.