Answer: Laertes and Anticleia
Explanation: Haha i just googled it.
It was justified through the Mandate of heaven. Basically. It was thought that only one legitimate ruler could be the ruler of china. And whoever that one ruler was, he was blessed with godlike powers.
Hoped this help :P
1. Maine would come into the country as a free state
2. Missouri would enter the country as a slave state
3. Slavery would be banned above the 36°30 line and allowed below it