One of the most publicized events that occurred in Bleeding Kansas was when on May 21, 1856 Border Ruffians ransacked Lawrence, Kansas which was known to be a staunch free-state area. One day later, violence occurred on the floor of the U.S. Senate when Congressman Preston Brooks of South Carolina attacked Senator Charles Sumner of Massachusetts with a cane after Sumner spoke out against Southerners responsible for violence in Kansas.
Several constitutions for the future state of Kansas were created, some pro- and some anti-slavery. The Lecompton Constitution was the most important pro-slavery Constitution. President James Buchanan actually wanted it to be ratified. However, the Constitution died. Kansas eventually entered the Union in 1861 as a free state.