Use the passage to answer the question.

How would the simultaneous admission of Missouri and Maine help to maintain peace in the United States?
(1 point)
• It defined the rights of slave and free states.
• It expanded the geographical size of the nation.
• It kept the number of slave and free states even.
• It would promote popular sovereignty in the West.

The simultaneous admission of Missouri and Maine would help to maintain peace in the United States by keeping the number of slave and free states even. This would prevent one side from having a significant advantage over the other and potentially avoid conflicts and tensions related to the issue of slavery.