(A) Abolitionist
(B) ** Sovereignty
(C) Slave Catcher
(D) Annexation
EXPLANATIONS BELOW
Concept note-1: -The idea of popular sovereignty as it pertains to the extension of slavery to the territories in the antebellum era was a political concept that allowed the residents of the territories themselves, rather than Congress, to determine whether to permit or prohibit slavery.
Concept note-2: -popular sovereignty, also called squatter sovereignty, in U.S. history, a controversial political doctrine according to which the people of federal territories should decide for themselves whether their territories would enter the Union as free or slave states.
Concept note-3: -The Democratic standard bearer, Lewis Cass of Michigan, coined the term “popular sovereignty” for a new solution that had begun to emerge. The premise was simple. Let the people of the territories themselves decide whether slavery would be permitted.
Concept note-4: -In 1854, Stephen Douglas most famously attempted to implement the measure with the Kansas-Nebraska Act. A major consequence of popular sovereignty’s application was the rush by both pro-and anti-slavery forces to populate Kansas and determine its fate, which manifested in violence and fraud.