US National Archives
Our Documents: The Kansas Nebraska Act
An outstanding, interactive copy of the Kansas-Nebraska Act, the legislation that repealed the Missouri Compromise. Historical context included, as well as links to larger images, a typed transcript, and a downloadable PDF file.
Kansas Historical Society
Willing to Die for Freedom: Look Back at Kansas Territory
This online exhibit teaches you about "Bleeding Kansas." Follow the hyperlinks to obtain a wealth of information.
PBS
Pbs: American Experience: John Brown's Holy War: Pottawatomie Massacre
PBS provides information on John Brown's involvement in the Pottawatomie Massacre and the reasons behind the massacre.
Other
Kansas Cyclopedia of State History: Pottawatomie Massacre
Describes the Pottawatomie Massacre which was John Brown's plan to drive the pro-slavers out of the area. From a 1912 encyclopedia.
Curated OER
National Park Service: Fort Scott National Historic Site: Bleeding Kansas
Discusses the effects of the Kansas-Nebraska Act. In particular, the site details incidents from the period known as "Bleeding Kansas."
The History Place
The History Place: The Kansas Nebraska Act
This site from The History Place talks about the Kansas Nebraska Act and the effects caused by its creation. The information is brief but very helpful for the subject.