Original sentence: His belief in confrontation led him to kill five pro-slavery southerners in what became known as the Pottawatomie Massacre in May 1856, though it should be noted that this was certainly not the first use of violence in Kansas.Unlike other Northerners, who advocated peaceful resistance to the pro-slavery faction, Brown demanded violent action
Edited sentence: In response to a raid on Lawrence, Kansas John Browne killed five pro-slavery southerners in what became known as the Pottawatomie Massacre in May [[1856].Southerners, so called "Border Ruffians" took the opportunity to set off a reign of terror to run free soil settlers out of state.Violence sprouted from the 1854 Kansas Nebraska Act which resolved the issue of slavery through Popular Sovereignty