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Why are immigrant countries generally more developed?

Two aspects:

1。 People in developed countries are willing to emigrate. It is very convenient for backward countries in Africa to immigrate. The question is, are you willing to go? Naturally, it will not become an immigrant country.

2。 Immigrants are mostly elites, because immigrants have many conditions that not everyone can achieve. In addition, people who are willing to immigrate from scratch have the spirit of hard work and will naturally contribute a lot to the country.

Like the above two, a virtuous circle.