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.
Explanation:
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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