Irredentism

Irredentism is a non-quadrant nationalist ideology which describes the political manifestation of the desire to reacquire territory considered to be "lost" or "unredeemed". Irredentists may want to reclaim territory that their country once owned, but have since lost, or may feel that their country missed out on reigning over land that they believe rightfully belonged to them. Irredentism is also known as Revanchism, however the latter is considered to have a more angry or revolutionary connotation.