Blue Fields Massacre
1889 CE.
Shown on the map at 27.246°, -80.616°.
The Jim Jumper massacre, or Bluefields massacre, was an incident in early 1889 at a Seminole Indian camp northeast of Lake Okeechobee, in St. Lucie County, Florida, United States. Jim Jumper, a biracial Seminole, killed several Seminoles, and was then killed by another Seminole.
Text from the Wikipedia article Jim Jumper massacre, licensed CC BY-SA 4.0.