Don't understand that assumption! What other parts of the world are you referring to. Japan (Nissan, Toyota, Honda) or Europe (BMW, Mercedes, Audi, VW, Volvo, Citroen, Saab, Peugeot, Fiat). The vehicles in the US may be bigger so that their larger occupants can fit in them but they are not anymore sophisticated than else where in the world. The engine development work even for US vehicle manufacturers such as Ford and GM relies on European and Japanese engineering expertise in their subsidiary companies in these global regions. Anybody reading this would think that the computer was invented in the US and that US vehicles are the only ones to have engine management systems.