The Kansas-Nebraska Act was an 1854 bill that mandated "popular sovereignty"–allowing settlers of a territory to decide whether slavery would be allowed within a new state's borders.

True.

Explanation:

The Kansas-Nebraska Act was a law passed in 1854, which allowed the settlers who would occupy Louisiana to decide whether slavery would be used and legalized in that territory or not. This was a very controversial law, causing many disagreements between northerners and southerners, as it reinforced government irresponsibility towards slaves, being one of the influential factors of civil war.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

imma have to go   the third option

sorry if i am wrong hope this

if i am right plz give me brainliest