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. 

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For example you could start a retail clothing store because you would need to have skills in business and you could start an photography business you would need to have skills in photography. hope this