The encomienda and slavery systems both contributed to which of the following developments

The Spanish propagated a caste system which was dependent on racial origins.

This system determined the social ranking of Europeans, Native Americans, Africans, and people of mixed race in their colonies.

Explanation:

Recall that a caste system is one where ones social standing is determined at birth. In the case of the Spaniards, given that they had interbred with Europeans, Native Americans and Africans, the generation resulting from such interbreeding were categorised socially according to how much close genetically they were to the Spaniards. In other words, the more Spanish one was the higher one's class was in the society.

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this is a good question! i'll do some research and come back when i have the answer!

the spanish  

hope this meaning spain btw