Deficit spending doesn't seem to matter much, until it does, and then it's way too late. For a long time, the dollar has been THE currency to have globally.
As much as one-half of the value of U.S. currency is estimated to be circulating abroad. The data tables below list the value and volume of U.S. currency in circulation calculated in billions. As of December 31, 2020, there was $2,040.7 billion in circulation, totaling 50.3 billion notes in volume.