Your comment makes it look like is a police action instead of interfering in the business of third countries in international waters, with the express goal of causing economic pain.
United States is still under the impression that it's post WWII era..
The good news is that American's grip is slipping and will no longer be able to exert the same level of power in the next decade or so.
You're right, no one is entitled to trade wit US but the US is not entitled to trade with the rest of the world either, including China, Russia, Europe and Middle East.
I think Americans should realize that the post WII era is well passed and "strong arming" nations isn't going to work.