The correct response is:
Each system developed as a way of ensuring labor for colonizers. Each system was based on race, which has had long-term effects on the structure of the societies of the Americas.
Chattel slavery and the encomienda system were both designed to provide a labor force for European colonizers in the Americas, relying heavily on the exploitation of enslaved Africans (in the case of chattel slavery) and Indigenous peoples (in the case of the encomienda system). Both systems had significant and lasting impacts on societal structures, economies, and racial dynamics in the Americas.