August 10, 1821 Missouri entered the union as the 24th state named after native American people who originally inhabited the land Missouri was acquired by the US as part of the 1803 Louisiana purchase at that time the territories occupants were mainly French settlers after the war of 1812 American settlers poured into the region in 1818 the speaker of the House of Representatives presented the first petition of the territory of Missouri, requesting statehood the question of Missouri’s admission as a slave or free state lead southern men, Henri Quaid, to devise the Missouri compromise an 1820 admitting Missouri as a slave state, while admitting Maine as a free state, and prohibiting slavery in Louisiana territory north of the parallel 36° 30 Missouri southern border liberty of Congress

Use the passage to answer the question how would the simultaneous admission of Missouri and Maine help to maintain peace in the United States
A) it defined the rights of slaves and free states
B) it expanded the geographical size of the nation
C) It kept the number of slaves and free states even
D) It would come out popular sovereignty in the west

C) It kept the number of slaves and free states even

By admitting Missouri as a slave state and Maine as a free state simultaneously, it helped maintain the balance between slave and free states in the union. This was important in order to prevent any one group from gaining too much power and potentially causing conflict. The Missouri Compromise was able to appease both sides and avoid any major conflicts over the issue of slavery at that time.