How did the Kansas Nebraska Act help cause the Civil War? Unanswered Questions What is the particular type of processor model and operating system on which a computer is based called.
Realignment of the Party System in the 1850s: The Republicans.. In 1854, Congress passed the Kansas-Nebraska Act, which opened new western territories to slavery. Southern Whigs generally supported the Kansas-Nebraska Act, while Northern Whigs remained strongly opposed to the expansion of slavery into the territories.