The entire post-WWII world order was deliberately designed by clever Americans who knew how to use the situation to its full advantage. Enshrining the USD as the world's reserve currency, a network of military bases around the world to protect trade lanes, a combination of propaganda and economic incentive to bring the best and brightest to work in the US, while deliberately transforming the economy from a manufacturing economy to a service and finance economy, always putting itself in a position to be able to extract rent from everyone else.
The last vestiges of this world order was the TPP. The US negotiated a trade deal that would cement its top position in the Pacific region, while curbing China's growing economy and influence.
And then Trump axed it, because he didn't understand it.
China understood perfectly what an opportunity that was for them, and they have been quietly become less and less reliant on trade with the US since.
The current US regime is now hell-bent on dismantling the remaining alliances, relationships, and trade agreements that actually kept the US on top, the ones that actually kept the US powerful.
...while baselessly claiming that the existing world order was somehow "unfair" or "a bad deal", and that whatever the hell they're doing now is restoring some kind of lost power. They clearly have no clue what the source of America's power really is.
And here you are repeating their talking points.
What do you mean, exactly, when you're saying that the US shouldn't "let the world do whatever they want" ? What specific trade policies do you think are unfavourable to the US?