David Potter suggests that much of the discord between Kansans and Missourians was less about slavery and more about land claims.(i) The territory had not yet completed land surveys even six months after it opened for settlement so people squatted on land they wanted. Disputes over those claims, largely between Missourian and new Kansan settlers, sparked the events that culminated in the 1856 raid on Lawrence.
It began with a killing. A pro-slavery man named Franklin N. Coleman killed in 1855 a Free-Soiler named Charles W. Dow south of Lawrence, Kansas in a land-claim dispute. [An account of the killing by Isaac T. Goodnow can be read here.] Because Coleman claimed self-defense, he was not arrested. In retaliation, a group of Free-Soil men threatened Coleman and his corroborators and burned their property. (ii) Douglas County sheriff Samuel J. Jones was sent to arrest the aggressors but was prevented from doing so by armed Free-Soil men lead by Samuel N. Wood.
Jones accepted the aid of an army of Missouri “Border Ruffians” who converged outside of Lawrence near the Wakarusa River with the intent of enforcing “Law and order in Kansas.” (iii) Then Kansas Territory governor Wilson Shannon averted violence through negotiation (President Pierce refused him Federal troops) and the band dispersed, albeit reluctantly. Because the threat of violence was so great, the episode became known as the Wakarusa War.
(i) David M. Potter and Don E. Fehrenbacher, The Impending Crisis, 1848-1861, (New York: Harper and Row Publishers, Inc., 1976), 206.
(ii) Ibid., 207.