Final answer:
The system that was NOT proposed on how to handle slavery in the territories was Protection of Property.
Step-by-step explanation:
The system that was NOT proposed on how to handle slavery in the territories was Protection of Property. The Protection of Property system did not specifically address the issue of slavery in the territories. This system focused more on protecting the rights of individuals to own and maintain their property, rather than addressing the slavery issue directly.
Learn more about proposed systems to handle slavery in the territories