Standard and Poor's has held its US debt rating unchanged at AA+, nearly three years after dealing Washington a historic cut to its top-flight rating.
S&P said the rating outlook was only stable, saying the country's "polarised policymaking environment and high general government debt and budget deficits" prevent a return to AAA status.
"A higher degree of political brinksmanship in recent years - that complicates the policy decision-making process, resulting in a somewhat weaker ability to enact reform - constrains the ratings," S&P said.
It also pointed to the doubling of government debt since 2007, and its expectations that while US borrowing have slowed significantly with an improved budget picture, debt growth is likely to pick up again at the end of this decade.
At the same time, S&P said the current ranking holds up given the resilience of the US economy, policy flexibility, and the unique status of the US dollar as the world's leading reserve currency.
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