The phrasing of your question is a bit odd, but I interpret it as
"Did the MO compromise allow 2 slave states into the Union?"
If that was what you meant, the answer is no.
The MO Compromise was made to keep the number senators from free and slave states equal.
When it was made, the number was equal, so every slave state had to be admitted in a pair with a free state (and the other way around)(an example is the first pair that the compromise was used for: Maine was split from Massachusetts and admitted as a free state, and Missouri as shortly after admitted as a slave state; every state admitted between 1820 and 1850, when California was admitted alone as a free state (with a pro-slavery senator)).
2 slave states were never admitted at the same time, lest the compromise be broken. The MO Compromise was replaced with another deal in 1850.
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The Missouri Compromise maintained the balance between slave and free states.
Missouri Compromise
The Missouri Compromise was put forth by Senator Henry Clay in an attempt to prevent the addition of the new territory of Missouri, as a slave slate, from tipping the balance of power in Congress to Southern States. Since Missouri was not an official state until this compromise's passing, the state's people had no representation in Congress or ability to affect this bill.
Slavery continued, a tense balance in the US Senate was maintained, and war was averted for a few more years.
The 1820 Missouri Compromise was put in place by Congress in order to maintain the balance between slave States and non slave States. Senator Henry Clay was one of the key politicians in formulated the Compromise.
The 1820 Missouri Compromise was put in place by Congress in order to maintain the balance between slave States and non slave States. Senator Henry Clay was one of the key politicians in formulated the Compromise.
the Missouri compromise
The Missouri Compromise was put into place in 1820 in the US Congress. It was put into place to create balance between slave owning and non slave owning states in the US a that time.
Missouri Compromise
The Missouri Compromise of 1820 was a compromise between pro-slavery and anti-slavery factions in Congress agreeing to prohibit slavery in states north of the parallel 36°30' north except in the state of Missouri. Additionally, the state of Maine was allowed to join the Union as a free state. This compromise was passed due to concerns of the creation of the state of Missouri destroying the delicate balance between slave states and free states in Congress.
The balance between slave-states and free states, so that neither side would dominate Congress.