Which of the following best explains the Missouri Compromise of 1820?

As violence against slaves increased, the government created a haven for runaway slaves in Missouri.

By admitting both a slave state and a free state, the nation's legislature hoped to keep a balance of power.

As fights about slavery increased, the legislature voted to return the right to choose whether to be a slave or free state to the states.

By creating a group of border states between the North and South, the nation's leaders hoped to avoid increasing disputes over runaway slaves.