If Missouri had joined the Union as a slave state in 1818, it would have intensified the sectional conflict between the North and South. This could have accelerated the debates over slavery in new territories and potentially led to earlier divisions within the country. The balance between free and slave states would have been disrupted, possibly prompting more aggressive stances from both sides, contributing to the eventual tensions leading up to the Civil War.
Missouri just joined the union as a slave state
That's exactly what happened, as specified by the Missouri Compromise of 1820!
Under the Missouri Compromise of 1820 Missouri was admitted as a slave state and Maine as a free state.
Missouri (1821), Arkansas (1836), Florida (1845), and Texas (1845) Hope this helps! :)
After a short time they joined the Union side and fought against the Confederacy. However a part of their citizen, especially those of Missouri and Kentucky, enlisted themselves voluntarily in the Confederate Army.
mAINE
Nope, Maine was also a anti-slavery state since the start of it's joining into the Union in 1820. Maine joined the Union from the Compromise of 1820. Missouri wanted to become a slave state, but in order to keep a balance between slave to anti-slave states, Maine was then admitted to the Union as a free state(Missouri Compromise of 1820).
Delaware, Kentucky, Maryland, and Missouri were four slave states that did not secede from the Union. West Virginia, another slave state, seceded from Virginia and joined the Union during the Civil War. it was 4 that didn't secede from the union.
Missouri joined as a slave state and Maine joined as a free state.
Missouri would be admitted to the union as a slave state and Maine as a free state.
Missouri was admitted as a slave state. This was part of the Missouri compromise in which Missouri would enter as a slave state and Maine as a free state.
After the Missouri Compromise of 1820, which allowed Missouri to enter the Union as a slave state and Maine as a free state, several other states entered. These included Arkansas (1836) and Michigan (1837) as slave and free states, respectively. The compromise aimed to maintain the balance between slave and free states, setting the stage for future conflicts over slavery as new states joined the Union.