Pottawatomie Massacre
May 24 Pottawatomie Massacre: John Brown and abolitionist settlers kill five pro-slavery settlers in Franklin County, Kansas
- May 27 Doctor William Palmer (the Rugeley Poisoner) found guilty of poisoning in Stafford, England
May 24 Pottawatomie Massacre: John Brown and abolitionist settlers kill five pro-slavery settlers in Franklin County, Kansas