Henry Ward's sister Harriet Beecher Stowe, had in 1852 written the anti-slavery classic Uncle Tom's Cabin.
They never even covered this in Americzn History in the 50's.
By 1855, Colt began to manufacture a bored through revolver that used a metal jacketed cartridge.
Uh, that would be Smith & Wesson, not Colt, and what is a "Sharpes carbine?" I have heard of Sharps carbines, from the 1870s, but not in Bleeding Kansas in the 1850s.