Irredentism
Irredentism is the desire of a state or some of its people in a state for the annexation of land of another state. Those who want the land say that it really belongs to them because the other state stole it, or they wish to liberate the people who live there who have the same ethnicity or some other connection.
The term was invented in the 1870s, when the unification of Italy left out Italians who lived in Austria-Hungary.
Irredentism Media
Map of Kingdom of Italy (1919) showing the areas claimed by Irredentism: in red Malta, in purple Corsica, in yellow with green points Dalmatia, Ticino and Nizzardo. I have used as a basic map an old map from an Italian geography and history school book of 1935 "Scuole Medie Inferiori", and I have written and painted on it.Cropped caption: L’Italia dopo la Guerra 1915-1918
It depends on the definition of irredentism whether South Korea's and North Korea's claim over the entire Korean Peninsula constitutes a form of irredentism.
The Nagorno-Karabakh conflict is an example of how irredentist movements, like Armenia's intervention, try to justify their aggression as humanitarian interventions.
The partition of Czechoslovakia from 1938 through 1939. The dark purple area shows the Sudetenland annexed by Nazi Germany.
The Falkland Islands is a British Overseas Territory but claimed by Argentina.
Surrounding the events of the American Civil War, various southern states (shown in bright and dark red) seceded from the United States.
Changes in national boundaries after the end of the Cold War and the dissolution of the Soviet Union and breakup of Yugoslavia