It's one that all of us have an obligation to meet.

它是我们所有美国人有责任面对的问题之一。

youdao

While they might persist for a long time, even a century, over time they have repeatedly switched from one form to another, typically when the money owed in one system becomes so large that the denomination must be altered to meet the obligation.

FORBES: Fiat Money Never Stays Golden Forever