What is the Treaty of Treason in The Hunger Games?

The Treaty of Treason is referenced in The Hunger Games series as the agreement that ended the First Rebellion of the Districts against the Capitol. As mentioned in the books, District 13 was not destroyed during this rebellion due to its role in developing advanced weaponry for the Capitol, and subsequently aided in suppressing the uprising to prove its loyalty. As punishment, the Capitol forced the other Districts to send two children per district each year to fight in the annual Hunger Games, a televised arena event where the participants attempt to kill one another until only one is left standing. The treaty ensures that the Capitol maintains control over the Districts by serving as a warning against future acts of rebellion.