What is the fictional nation in the 'The Hunger Games' trilogy?

The Hunger Games universe is a fictional world appearing in The Hunger Games trilogy written by Suzanne Collins. It consists primarily of the fictional nation of Panem, its Capitol where the totalitarian government resides, and the outlying districts, numbered 1 to 12, each with a different economy. In addition, there is the secretive District 13, where a rebel force is building strength. The Hunger Games themselves are an annual event in which citizens from the districts, selected through a process called "reaping", are forced to participate in a battle to the death. The universe also contains fictional flora and fauna, such as the Mockingjay, a bird whose mimicry is used as a plot device, and after whom the third book in the series is named.

Panem replaced the 21st century North American nations at an unspecified future time after a series of ecological disasters and a great war. The name Panem comes from the Latin word for bread. Panem consists of a Capitol city located in the Rocky Mountains, surrounded by thirteen outlying Districts. The government is a totalitarian dictatorship similar to ancient Rome, a police state in which the Districts are subservient to the Capitol, expected to provide economic goods in exchange for protection provided by "Peacekeepers".