The principle of popular sovereignty was an important part of the Kansas-Nebraska Act.
Step-by-step explanation:
The major principle of popular sovereignty was the concept that settlers in new territories voted to choose whether or not or to not enable slavery in their territories.
The Kansas-Nebraska Act (30 might 1854) enabled for the settlers of Kansas and Nebraska to vote on whether or not or to not allow slavery as part in their territories, the primary time Congress recognized in style sovereignty because the deciding consider whether or not or not a territory was to be free or slave.