Fitch Ratings reaffirmed the U.S. sovereign credit rating at ‘AA+’ with a stable outlook Thursday, citing strengths like high per capita income and the financial flexibility afforded by the U.S. dollar. The rating agency also flagged growing concerns over escalating debt and increasing political polarization. According to Fitch, this heightens the nation’s vulnerability to economic and confidence shocks. The “government has failed to meaningfully tackle large fiscal deficits, the growing debt burden and looming increases in spending associated with an aging population,” the Fitch report said. …