if their banks fail. The US explicitly refused to rule out such a possibility when European banks were doing so to their customers in the aftermath of the crash that started in 2007 resulting in "The Great Recession".
Of course the US embarked upon the greatest money printing backed bailout in the history of the world to pull everyone's fat out of the fire:
https://www.youtube.com/watch?v=3dl1y-zBAFg
https://www.ksdk.com/article/life/vintage-ksdk/st-louis-barbers-union-raises-haircut-prices-1996/63-bf50492e-097b-4eac-98b9-cef2dd9cd7ac