Explanation:
The early migrants firstly settled in America and came across Bering Straight .
Due to these diverse population , they scattered .
And the Natives developed by hunting , gathering , fishing . and started farming , and stayed at one place .
But before the appearance of the Columbian population , North America were having around 16 million Indians .
And
Thereafter , the population of Indians reduces due to the loss of battles against the spread of the White civilizations .
Because the higher you will go this colder it will get or depending which mountain you are aiming for just like Mount Everest.
Fishing is the leading industry in Greenland.
Mexico, I believe was the second to become independent, after the United States
