Final answer:
The Missouri Compromise of 1820 resulted in Maine entering the Union as a free state, Missouri as a slave state, and the prohibition of slavery in certain territories.
Step-by-step explanation:
The Missouri Compromise of 1820 addressed the admission of Maine and Missouri into the Union and the prohibition of slavery in certain territories. Maine entered the Union as a free state, while Missouri entered as a slave state. The compromise also established that slavery was prohibited in the territories north of the 36°30' line, which became the dividing line between slavery and freedom in the Louisiana Purchase lands. Additionally, the compromise allowed slaveholders to pursue escaped enslaved persons in free areas.