In a significant move, Moody’s has downgraded the US credit rating from AAA to Aa1, citing concerns over rising entitlement spending and insufficient government revenues to support interest payments. This downgrade marks the end of the major credit-rating firm’s perfect AAA status for the US sovereign debt.
Source: https://www.barrons.com/articles/moodys-us-credit-rating-treasurys-investors-fe84bad6