How do historians believe that the first peoples arrived in north america

the ice bridge

Explanation:

there was an ice bridge during the ice age that connected Russia and the Alaska.  The historians believed that the Natives crossed over this bridge to get into Alaska, into Canada, and slowly traveled down into South America.  

south, because if you took a map you would see texas is directly in the middle of east and west, but it is also downwards towards mexico, therefore it is south

answer; utilitarian;