The most accurate response would be: "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 pivotal labor systems in the Americas, created to provide the necessary workforce for colonial enterprises. Chattel slavery primarily involved the forced labor of African people, while the encomienda system was a Spanish labor system that granted colonizers the right to extract labor from Indigenous peoples. Both systems were rooted in racial hierarchies and exploitation, leading to significant demographic, social, and economic impacts that resonated throughout American history and continue to influence modern societies.