Which event sparked Abraham Lincoln's reentry into politics?

Question

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Lincoln reentered politics after the passage of the Kansas-Nebraska Act in 1854. This act, which repealed the Missouri Compromise and allowed for popular sovereignty in determining the issue of slavery in the territories, was seen as a major turning point in the national debate over slavery and its expansion. Lincoln was motivated to speak out against the act and the expansion of slavery, which ultimately led to his election as president in 1860.

Which Event Sparked Abraham Lincoln's Reentry into Politics