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People rejected the idea of having slaves and stopped ships from bringing more slaves.
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In the interest of maintaining unity, politicians had mostly moderated opposition to slavery, resulting in numerous compromises such as the Missouri Compromise
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Growing in the population, it began to become a threat to slavers
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David Wilmot proposed the Wilmot Proviso, which would ban slavery in the new lands.
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In 1845, newly elected U.S. President James K. Polk made a proposition to purchase Alta California and Santa Fe de Nuevo México from Mexico. When that offer was rejected, President Polk moved U.S. troops south into the disputed mexican areas.
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This bill defused a political confrontation between slave and free states on the status of territories acquired in the Mexican–American War.
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Pro- and anti-slavery forces struggled violently in “Bleeding Kansas,” while opposition to the act in the North led to the formation of the Republican Party
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The Republican Party nominated Abraham Lincoln as its candidate for president on an anti-slavery platform.
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Confederate forces bombarded Fort Sumter
