Because they run out of food sources ect. OX layd
Many different names and many arguments because the American Indians were migratory, often combative and rarely sedentary. Here are a few: Apache, Yuma, Havasupi, Hopi, Zuni, Navajo, Paiute, Mojave,...
Cahuilla,Chumash,and Miwok
In the far North, it is mostly Inuit if you go down south there are different tribes besides Inuit
Tapuias and Avás-Canoeiros were the 2 ethnicity from the State of Goias, where Brasilia is located.