The US have to tell the world why and how the dollar is so valued in the world.
Tell the world what exactly? Everybody knows why the Dollar is valued and it’s because of it’s usage in most international trades and the petro-dollar, As many replies above have mentioned
For crying out loud, every other currency in the world is useless compared to the dollar and even in recession the dollar is still powerful.
This statement is actually wrong! Not “every currency” is useless or have lesser value compare to the US Dollar, there are currencies with more exchange rates and value than the US dollar right now, and they’re about five of them I think including currencies like the British pounds and Kuwaiti Dinar. So you might actually want to do some research about this..
In the mix of the US and Iran war the dollar is strong. So i believe even if the world economy is in recession the dollar will still wax stronger. Is it that the US have the best economist in the world?
It isn’t about having the best economist in the world or something like that, it’s just a simple matter of economy and trade..
If you had studied the topic in greater depth rather than just skimming the surface, you would have learned:
- The trade balance between Russia and India, as well as between Russia and China, is not in Russia’s favor. China and India use Russian rubles to buy RESOURCES, while Russia uses rupees and yuan to buy only what China and India allow it to. At the same time, most of the yuan and rupees received by Russia... sit in Chinese and Indian banks and, in essence, do not belong to Russia
Saudi Arabia entered into TEST contracts denominated in yuan, but did not continue this practice. If Saudi Arabia can buy something in China with yuan, the question is: what can it buy-for rubles, for example-on the global market?

The answer is simple-NOTHING!
Regarding "It isn’t about having the best economist in the world or something like that, it’s just a simple matter of economy and trade...", I’ll give you a couple of examples, and you explain why this situation exists, even though the country has an economy and resources

Democratic Republic of the Congo
Possesses the largest reserves of cobalt, lithium, copper, and diamonds.
More than 60% of the population lives below the poverty line.
Angola
It is one of Africa’s leading exporters of oil and diamonds.
It suffers from catastrophic wealth inequality and high levels of poverty.
I could give many more examples, but just explain these-do they really not need a good economist?
And by the way, a question-can they buy anything on the global market with their local currency?