No European countries belong to the US.
No countries belong to another country. If that was the case then the "country" wouldn't be a country.
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No country belongs to the US.
All countries have the right to self-determination and not be forcibly claimed or annexed by another country. This principle is enshrined in international law to protect a nation's sovereignty and territorial integrity. Any attempt to violate this can be seen as aggression and a breach of international norms.
All three countries belong to the northern, western hemisphere.
All three countries belong to the northern, western hemisphere.
45 countries
Actually, more than half of Europe's countries belong to the European Union. It is not important how many countries belong to it, even when less than half of Europe's countries did belong to it.
economic status of the countries who belong in first world country
There are only three countries on the list of countries that do not belong to the UN. Those three countries are Kosovo, Vatican City, and Taiwan.
The countries that belong to the Scandinavian countries are Denmark, Norway, Sweden, Finland, Iceland, and sometime Greenland as it is almost always not included.