What are the advantages of letting states make all their own laws?

battle of survival between farmers and the rabbits during the great depression

following type of cultural development caused people to want and buy new products on the market :

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after the spaniards introduced horses to plains native americans, the lives of the tribes changed. tribes became less settled and sedentary. the horse allowed them to hunt animals such as bison or buffalo, and, instead of staying in one place, tribes began to be nomadic.