Summary of "Native Americans"

Many scientists think that the earliest people travelled from Asia (many thousand years ago) to North America. 
At that time, the water that separates the northern parts of Asia and North America would have been frozen.
The earliest North Americans were nomads.
After a time, they began to learn about agriculture.
Then with better sources of food, they didn´t need to move place to place for eat, so they began to look for more permanent homes.
They wanted to live near water sources, for they could water their crops and take care of the water needs of living beings.
The clothing they wore, the kind of houses and the king of food that they ate depended upon the region in which they lived.