"Irredentism is a political and popular movement whose members claim (usually on behalf of their nation) and seek to occupy territory which they consider "lost" (or "unredeemed"), based on history or legend. The scope of this definition is occasionally subject to terminological disputes about underlying claims of expansionism, owing to lack of clarity on the historical bounds of putative nations or peoples.
This term also often refers to revanchism but the difference between these two terms is, according to Merriam-Webster, that the word "irredentism" means the reunion of politically or ethnically displaced territory, along with a population having the same national identity. On the other hand, "revanchism" evolved from the French word "revanche" which means revenge. In the political realm, "revanchism" refers to such a theory that intends to seek revenge for a lost territory." - (en.wikipedia.org 27.09.2021)
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