A country would meet all three if it had a trade surplus with the United States of at least $15 billion, a current account surplus of at least 3 percent of gross domestic product, and if it had engaged in persistent, one-sided intervention in foreign exchange markets.
Being on the list isn’t a bad thing. You only have to have two of the three things listed in order to be on the list and any of our major trading partners would automatically be on it. It’s simply a mechanism for the US government to have reports on other economies it does business with.