A credit rating firm has concluded a review of the United States’ credit rating and reiterated that it deserves the highest rating.

Fitch Ratings had started a review of the U.S. debt rating in October and warned it might downgrade the nation’s rating.

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Fitch said Friday that the U.S. rating remains at “AAA.” The agency adds that the debt-ceiling crises in 2011 and 2013 don’t appear to have affected the country’s ability to borrow. Fitch also says deficits that are expected to fall played a role in its decision.

Another ratings agency, Standard & Poor’s, downgraded the U.S. credit rating one notch in 2011 after a standoff in Congress over whether to raise America’s borrowing limit. S&P’s rating remains at “AA+”