slavery was banned in territories north of parallel 36°30, aside from Missouri. The long-term effect was the division of the nation into South and north sections, which defined the following battles over slavery and also the Civil War.
The Missouri Compromise was designed to create balance between slave and non-slave states. By using it, the nation was equally divided between slave and free states. Acknowledging Missouri like a slave condition gave the south yet another condition compared to north. Adding Maine like a free condition balanced things out again.
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