Irredentism
Appearance
Irredentism is claiming a right to territories belonging to another state on the grounds of (at times merely alleged) prior historical possession.
Irredentist movements include those of Gabrielle DAnnunzio taking over Fiume after World War I, German claims in the Nazi era to Poland and Sudetenland, and claims to the nation of Jordan by Rehavam Zeevi's Moledet party in Israel.