District 13 was once a prominent district in Panem, known for its nuclear technology and military operations. However, after a rebellion against the Capitol, which culminated in the Dark Days, District 13 was believed to have been destroyed. The Capitol claimed victory, and for many years, the existence of District 13 remained a rumor.
In reality, District 13 had not been destroyed but had gone underground. The district became a center of rebellion against the Capitol, surviving in secrecy. This hidden existence allowed District 13 to regroup and prepare for the eventual uprising against the oppressive regime of the Capitol.
Throughout the events of the Hunger Games series, it is revealed that District 13 plays a crucial role in the rebellion led by Katniss Everdeen, offering strategic support and a base for operations against the Capitol. This revelation significantly impacts the dynamics of the conflict and highlights the resilience of the districts in their fight for freedom.