The reserve currency status makes all the difference on how much of all this you can do and under what conditions. That's the difference and that's why US had it so good for so long and now is due for such a large correction. Also, US is blessed with huge natural reserves, didn't actually waste it all on drugs and alcohol but did in fact created some of the best institutions in many areas so maybe it wouldn't be that bad if the politics don't make it bad.
It's not a reserve currency because the US decided it is, it's a reserve currency because everybody else decided it is. They decided that because they decided it was in their own best interest to trade in and maintain reserves of USD.
But whatever difference it makes is still just a matter of degrees. Countries keep reserves of and trade in currencies other than USD. Some get more benefit than others from this, and they all work to benefit from what advantage they can take from their own positions within their means to do so.
USD became the reserve currency in the Bretton Woods, when it was pegged to gold and major currencies were pegged to USD. This was pretty much demanded by US in the Bretton Woods conference.
In 1971 US unilaterally scrapped the Bretton Woods and essentially stole the gold reserves. Other countries protested heavily but could not really do much.
US then transitioned to the petrodollar system where demand for and value of the dollar is/was ensured by dollar monopoly in oil trade. This was done with deals with oil producing countries with varying levels of coercion.
Granted it is in a country's best interest not to piss off the world's largest military. Silver or lead is a decision too.
The gold reserves wasnt stolen - it is the US's gold that was acquired as a result of WW2. The revocation of the convertability of the US dollar to gold was suspended because it became impossible to honor it due to the increase in the amount of circulating dollars (what people generally call printing - it isn't "printed", it is debt created that produced more currency). And imho, while it seemed like other countries complained, i think this system allowed the world to move off the gold standard - a system which does not allow for flexibility.
And the idea that the US somehow enforces their dollar as being the reserve is moot - it is simply not true. Countries use the US dollar for trade because both sides of the trade believes that the other side cannot "cheat" using this currency, and implicitly believes that the US gov't won't "cheat" on behalf of one side either.
Unfortunately, this trust is being undermined from various sides, including the current US administration (and i have a hard time believing that the trump administration doesnt know this - it seems deliberate).
The situation was similar to there being a gold ETF that just decides to remove the gold peg and start diluting the shares. Whether that's essentially stealing or not is a matter of terminology IMHO.
US for sure didn't do it out of goodness of their hearts even if it led to arguably better monetary system. And US did get lopsided benefits out of it. Consistently recieving more goods than you give out is a huge benefit.
Is the USD due for a correction? I would agree the current policies do not help, however I have a hard time seeing any other currency actually replacing the dollar as the world's reserve currency.
If USD stops being global currency, there probably will not be just one that replaces it, but there will be several competing ones (USD still probably being there), for foreseeable future, with countries hedging bets.
