"We denounce those threats of disunion ... as denying the vital principles of a free government, and as an avowal of contemplated treason, which it is the imperative duty of an indignant people sternly to rebuke and forever silence."
-- 1860
Consider the primary source quotation in the graphic and determine the most likely source amongst the answer choices below.
The Republican Party Platform
Emancipation Proclamation
Confederate States of America Constitution
South Carolina Secession Convention