Due to the different status of the US dollar and the Euro, the United States created the world's first trinity currency of international reserve, US dollar settlement and oil pricing by virtue of its strong economic strength after World War II, a large amount of US dollar loans to the world (maher's aid plan to Europe) and 70% of the world's gold reserves saved by war money (US dollars can be exchanged for gold). The world currency circulation also needs a lot of US dollars.

Therefore, even if the United States catches up with the dollar, the world will not reject the dollar. Moreover, the oil in the Middle East has always been priced in dollars, and the world commodities (futures) have always been priced in dollars. If you want to buy Middle East oil, you must give Middle East oil dollars, and you must also use dollars to buy and sell futures in new york. It also shows that circulation also needs a lot of dollar bills.

The euro is just a new European monetary unit, so there is no such treatment and no one gives it such treatment. The Yankees use these to make extra money.