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Which countries do North American immigrants mainly come from?

Reference answer:

The first immigrants (5,000 years ago): from Asia (Indians)

The second group of immigrants (1000 years ago): vikings from northern Europe (Greenland)

The third group of immigrants (500 years ago): from Europe (West, Netherlands, Britain, France, Germany ...)

The fourth group of immigrants (400 years ago): slaves from sub-Saharan Africa and Latin America.

The fifth batch of immigrants (before 150): employees from China and Japan.

Now: There are more people in China.

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