Just like Acura and Lexus, Infiniti appeared as a luxury branch in the USA. Nissan was focused on low-cost cars and trucks there, so it needed a new brand to try and sell more expensive models. At first, Infiniti had nothing but rebadged models originally developed for Japan. Once it reached a steady sales performance in the region, it earned its own line. As you can imagine, it sells some sedans and several SUVs nowadays.