I think it’s clear the dollar will not be the main world reserve currency for much longer. The dollar was gold until 1933, it was still gold for nations until 1971 and here we are 50 years into a totally fiat system and it’s looking weaker then ever. There’s a clear war on cash that is slowly being lost. The example of using the same dollar in 1920 as 2020 works today but there’s no chance it’s the case in the next decades. The government and central bank admittedly want a new digital dollar that will be different. I would bet anything the dollar is not the reserve current past 2030 or 2040 at latest. Money printing fiat to Infinity is getting worse every decade snd it’s on its last legs as reserve currency. Fiat currency never lasts long. The dollar just breaking 50 years since removing any sliver of gold standard shows it’s winding down. In 1920 we could redeem dollars for gold or silver at every bank. It’s certainly very different. And anyone who spends a 1920 dollar will get looked at funny most the time and should keep the bill as a collection item.