The main types of art produced by the native americans of the great planes were portable because the tribes of that region were

Nomads

The main types of art produced by the native Americans of the great planes were portable because the tribes of that region were nomads. it makes sense that they made portable art, as they move through the territories, making easy to transport and collect such form of art instead of big pieces that would have been difficult to transport. 

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art. 

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