The document summarizes Standard & Poor's decision to downgrade the US credit rating from AAA to AA+ for the first time. It cites the country's high and growing debt levels, the modest deficit reduction from the recent debt deal, and lack of confidence in the political system's ability to enact further deficit reduction. The immediate effects of the downgrade are uncertain but likely to be limited given the small rating change and special status of US debt. However, failure to enact additional deficit reduction could lead to further downgrades and higher borrowing costs.