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It allowed the territory of Missouri to join the USA as a slave-state.
There was no Civil War while the Missouri Compromise was in force. It kept the peace for thirty years. It was the debate over the admission of California, following the Mexican War, that made the Missouri Compromise inoperable (because the new state extended so far on either side of the line) and a new Compromise had to be worked out. This one did not last.
It preserved a nation that was half free and half slave.
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Abraham Lincoln was beginning to lose interest in politics until the Missouri Compromise, a compromise between pro-slave and anti-slave factions, was repealed. He became aroused to make an impact on society based on that.
An advantage of integrating OPSEC principles in your day-to-day operations is that it:
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made it uber cooler.
It really doesn't have any major impact on today's government
Well the negitive impact would be overall less trees and the positive impact would be overall more toilet paper.
That line was made obsolete. The new arrangemen was meant to be local voting on slavery in the new states of Kansas and Nebraska.