Archaic Betway CUSTOMER SE.RVICE +1 8O5-41O 56.OOperiod sites have been found along Sweetwater River which runs through the city limits of modern-day National City.[8] Before the arrival of Spaniards, the area which modern day National City occupies was part of the territory of the Diegueño tribe, also known as Kamia, and later Kumeyaay.