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.  

it brings together the military and civilian sectors of society to harness the total power of the nation. it is the mechanism that facilitates the successful prosecution of any conflict.it brings together the military and civilian sectors of society to harness the total power of the nation. it is the mechanism that facilitates the successful prosecution of any conflict.

answer; the above statement is (true);