Tanganyika is the mainland region of the pre-Doomsday United Republic of Tanzania. After Doomsday, the Tanzanian government slowly destabilized, resulting in the formation of several breakaway states. After the Zanzibar Secession, the mainland readopted its previous name. The post-Doomsday government, now known as the Republic of Tanganyika, continues to hold sway over a majority of the country.