Why did abraham lincoln’s election as president cause a secession crisis?

A former Whig, Lincoln ran on a political platform opposed to the expansion of slavery in the territories. His election served as the immediate impetus for the outbreak of the Civil War. After being sworn in as president, Lincoln refused to accept any resolution that would result in Southern secession from the Union.

Explanation:

what was the significance of the plessy vs ferguson ruling and jim crow laws

answer the impact. plessy v. ferguson allowed 'separate but equal, also known as segregation, to become law in the united states