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The first American Intervention.
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Emphasized the evil of slavery. The North becomes increasingly abolitionists. The south grows more defensive of slavery.
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Popular Sovereignty will determine slavery issues in any state. Slavery can exist anywhere.
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Supreme court rules that Missouri Compromise is unconstitutional. Congress has no power to regulate slavery. Slaves are not citizens thery are property and have no rights.
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Radical Abolitionist John Brown attacks federal armory in attempt to start a slave revolt.