Under the repartimiento system, many Spanish colonists treated American Indians with respect.
as enslaved people.
with fear.
as students.

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So I believe the correct answer is:

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.