OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has affirmed the Financial Strength Rating (FSR) of A+ (Superior) and the Long-Term Issuer Credit Ratings (Long-Term ICR) of “aa-” of RiverSource Life Insurance Company (Minneapolis, MN) and its wholly owned subsidiary, RiverSource Life Insurance Co. of New York (Albany, NY) These companies represent the key life/health (L/H) insurance subsidiaries of Ameriprise Financial, Inc. (Ameriprise) (headquartered in Minneapolis, MN) [NYSE: AMP] and are collecti