惠誉：美联储“独立性”为美债评级关键

Group 1 - The core viewpoint of the article is that Fitch Ratings considers the "independence" of the Federal Reserve as a key factor in maintaining the United States' AA+ sovereign credit rating [1] - Prior to Fitch's statement, Federal Reserve Chairman Jerome Powell disclosed that he received a subpoena from the U.S. Department of Justice, indicating that federal prosecutors have initiated a criminal investigation against him [1] - Last October, another credit rating agency, S&P Global Ratings, also identified the "independence" of the Federal Reserve as a critical support for maintaining the U.S. sovereign credit rating [1]