Comment US created the modern rules based order (Score 5, Informative) 136
The rest of the world accepted American leadership because in 1945 the USA was the world leader in trade, in promoting free trade, protecting trade, in trade and relations expertise. The USA was also paying to rebuild Europe and parts of Asia.
The world continued to accept these slightly skewed trade rules because negotiating new rules is hard and the USA, was in large part a reliable, trust worthy and intelligent leader in world trade that had spent 80 years building good will and making everyone rich.
Trump has blown up all that good will, he has destroyed the trustworthiness of the USA and no one thinks of American policy as intelligent. The USA still has by far the most vibrant economy in the world, they are the leaders or are second in almost every market that matters, farming, mining, AI, software... However, the rest of the world will slowly reconfigure trade away from the US. It will take a while. Countries will suck up to Trump during this transition but they will move away. It took 80 years (or 150 depending on who you are) for the current global system to be created. It will take a while to realign it but it will happen.
We will all be poorer when the existing system is replaced. No one else can fill the role the old, reliable, intelligent USA used to hold.