Event turned the tide prior to the civil war. less than a month after this, south carolina and other states declared their intent to secede from the united states.

The Election of 1860.

Explanation:

The election of 1860, in which Abraham Lincoln and Hannibal Hamlin won, would turn out to be one of the most important factors that later would turn the tide towards the Civil War. Their politics and orientations were not shared by the states that would later secede from the U.S.

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