OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has assigned indicative ratings of “a-” to senior unsecured debt, “bbb+” to subordinated debt, “bbb” to junior subordinated debt and “bbb” to preferred stock of the recently filed shelf registration of The Allstate Corporation (Allcorp) (Northbrook, IL) [NYSE: ALL]. Additionally, A.M. Best has assigned the indicative ratings of “bbb” of the preferred securities of Allstate Financing VII, VIII, IX and X, which may be issued under Allcorp’s shelf registra