The source was the land that they owned that they could control the peasants in their feudal system.
Answer:
if you scroll down to the bottom of google the asnwer hould sbe there
Explanation:
It allowed Missouri and then Maine (which also applied for statehood) to become states. A lot of states were on the edge on wether to admit or not allow a state that allows slavery into the states. In the end - both were admitted and became states. However, Missouri was left as a slave state and Maine was set as a free state.
C. rare and costly dark stone
To rejoin the union hopes this help