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What is the name of the United States as an immigrant country?

Some Europeans who don't like America very much call Americans "Uncle Sam". They think Americans are not tasteful enough.

Also known as the "Jin and Yuan Empire"

"A country without childhood", because the United States directly jumped from slave society to capitalist society and did not experience feudal society, is not a complete development process from the perspective of social development, so it is said that there is no childhood.