Memory Causes for the Civil WarVersión en línea Identify the causes that led to the American Civil War. por Andrew Balzer Let the people of the territories themselves decide whether slavery would be permitted. Popular Sovereignty It allowed people in the territories of Kansas and Nebraska to decide for themselves whether or not to allow slavery within their borders. Fugitive Slave Law Novel written by Harriet Beecher Stowe that showed the horrors of slavery. loyalty to one's own region or section of the country, rather than to the country as a whole Kansas-Nebraska Act Sectionalism Compromise of 1850 California entered as a free state Uncle Tom's Cabin It required that all escaped slaves, upon capture, be returned to their masters and that officials and citizens of free states had to cooperate.