What was the election of lincoln so important to the state's secession

there has only been 12 presidents. the 12th president is/was moon jae-in

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.

multiple choice? can i see the answers?

true, they can both only can be studied with ancient text.