The Kansas-Nebraska act election of 1860 which of these did the Kansas-Nebraska act do allow states to decide within their own border slavery map out railroads through Kansas and Nebraska effectively overturned the compromise of Missouri 1820 abolished slavery

The Kansas-Nebraska Act allowed states to decide within their own borders whether to allow slavery. It did not directly address the mapping out of railroads through Kansas and Nebraska. While the act effectively overturned the Compromise of Missouri in 1820, it did not abolish slavery. It is important to note that the election of 1860 was not specifically related to the Kansas-Nebraska Act, but instead, it marked the beginning of Abraham Lincoln's presidency and later led to the American Civil War.