United States, members of the EU and also the other advanced economies such as Japan
It is important as international trade improves or sustains relations between nations and "international trade accounts for a good part of a country's gross domestic product. It is also one of...
Triad Nation typically means United States, European countries who are part of EU and Japan.
If by primary, you mean major, then: Fifth: D Third: B Root: G
A three noted chord (apex)