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The Missouri Compromise was effective for a short while, when westward expansion was not a serious thing. It kept the balance of slave states in the Union which appeased the North and South, who were pitted against each other because of this conflict. However, as westward expansion became a bigger movement, legislation such as the Kansas-Nebraska act ignored the Missouri Compromise line, as did much of the settlement in the West. Instead, it relied on popular sovereignty.

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12y ago

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