The reunification of Ireland in 2024, which Data cites in The High Ground as a historical case in which a campaign of political violence achieved its aim.
The Irish Unification of 2024 is mentioned in the Next Generation episode The High Ground. While the Enterprise-D is at Rutia IV, where Ansata separatists are carrying out bombings, Data tells Picard that he finds terrorism difficult to understand because history shows it has sometimes worked.
He lists several examples of political change brought about by violence, among them the Irish Unification of 2024. Picard accepts the point but answers that he cannot agree that such methods are ever justified by their results.
No further details of the event are given. Because of the line, the episode was cut or left unshown by some British and Irish broadcasters for many years after it was made.