[runeks]

> […] the countries of the world decided to use the US currency as an intermediary because of the stability and assurances (that has recently been shocked by financial sanctions of magnitudes never seen before).

After WWII, the world agreed to use the US Dollar as reserve currency because the US promised to exchange every 35 USD for one troy ounce of gold, as per the Bretton Woods agreement.

And when the US defaulted on this obligation in 1971 the world continued using the USD since there was no other politically viable alternative.