Spain tried to establish its empire in the Americas by sending missionaries to convert indigenous peoples, paying indigenous peoples for their land as well as sending conquistadors to conquer existing empires.
The Spanish expansion has sometimes being called as "gold, glory and God". These people were in constant search of material wealth, were working for the enhancement of the conquerors' and the crown's position, as well as simultaneously working for the expansion of Christianity.
In order to control its newly formed empire, Spain created a formal system of government to rule its colonies. To demand more and more labor and taxes from America, they made the native Americans work in the gold and silver mines.
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