American car brands Jeep, Ram, Dodge and Chrysler are struggling under their new owner. The European-American giant Stellantis is the world's fifth-largest automaker by volume, according to S&P Global Mobility. The 2021 merger of the French maker Groupe PSA and the American-Italian Fiat Chrysler promised billions of dollars of savings in synergies and new opportunities for brands spanning two continents to share the burden of developing costly new technologies such as electric vehicles and software. Some of ...