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The outbreak of the Mexican american war due to unsloved border disputes between the republic of Texas and mexico

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The annexation of texas when texas was admitted as a slave state

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John O'Sullivan initiated the phrase 'Manifest Destiny' encompassing the idea that Western Expansion as a divine right of the American people highlighting the extension of slavery issue

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The establishment of the Abolitionist Movement calling for the Emancipation of slaves

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banning all all petitions calling for the Abolition of slavery remaining in place between 1836 and 1844

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the sectional interests of the North and the South were brought into open conflict for the first time during the 1832 Nullification Crisis

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Underground escape route which was to help slaves escape

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The 1820 Missouri Compromise was reached admitting Missouri as a slave state and Maine as a free state , retaining the balance between the entry of slave and free states into the union

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Social Reformation was sparked by the Christian revivalist movement referred to as the Second Great Awakening

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guaranteeing the right of a owners to recover escaped slaves and help in the return of fugitive slaves

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The emergence of new political parties, such as the Republican Party

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New inventors that changed America

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the emergence of reformist societies such as the Abolitionist Movement calling the Emancipation Proclamtion

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sparked by the Christian revivalists movement refered to as the Second Great Awakening

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rapid entrepreneurial path in the North, slower rate in the South

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slavery fostered an elite, feudal society in South with social status taking precedence over making money

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Different lifestyles of the North and South, city life versus farm life

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different commercial interests in the North and South

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the issue of "States' Rights" federal power versus sovereign state power