This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
The Burn was an event that occurred sometime between the 3060s and the 3080s during which most of the galaxy's dilithium mysteriously exploded, causing widespread death and destruction. The United Federation of Planets was unable to determine what caused the disaster, nor could it prove the event would not recur. By 3188, the Federation had largely collapsed as a galactic power. (DIS: "That Hope Is You, Part 1")