The system you are talking about is the solar system.
There are 5: Puerto Rico, the<span> </span>U.S. Virgin Islands<span>, </span>Guam,<span> the </span>Northern Mariana Islands, and the American Samoa.<span />
Answer:
the negative effects are sometimes referred to as "brain drain". The notion of the brain drain is largely unsupported in the academic literature. According to economist Michael Clemens, it has not been shown that restrictions on high-skill emigration reduce shortages in the countries of origin.
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