How did spain justify enslaving native americans?

Which of the following led to a continuation of the treatment in the excerpt above? a)the brutality of the trans-atlantic african slave trade. b)spanish repression after violent native uprisings in new spain during the 16th century. c)european competition to quickly establish colonial holdings in the new world. d)the reliance of the spanish on native americans to provide labor under the encomienda system.

In what primary way did the goals for us intervention in europe differ from those of the soviet union

Even though the u.s. declared neutrality, who did most americans side with in wwi?