I think that you are ignoring Newton's 3rd law, which pretty much can be applied to economics in this case. What made the US really great was the fact that it was the center of the liberal world order and the coalition of friends that it built around itself, including the EU countries. Let's see how well the US does when it loses most of its friends. Focusing on the EU, the US wants to balance the goods trade deficit with the EU, but it has a services surplus with the EU. Goods deficit vs services surplus roughly balanced each other before the tariffs. Guess what we in the EU will need to do? In the end it will be loose-loose for everyone, but in the long run the then friendless US will be the biggest loser.