CHICAGO — After years of credit ­stability, Chicago saw Fitch Ratings drop its general obligation rating Thursday to AA from AA-plus due to the weakening fiscal position of a city struggling with rising labor costs, lackluster revenue ­collections, and a burdensome unfunded pension ­liability.

The rating agency assigned a negative outlook to Chicago’s $6.8 billion of GO debt, indicating additional downgrades may be ahead if those problems are not resolved.

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